1231010220 has 192 divisors, whose sum is σ = 3874106880. Its totient is φ = 289536000.

The previous prime is 1231010213. The next prime is 1231010227. The reversal of 1231010220 is 220101321.

It is an interprime number because it is at equal distance from previous prime (1231010213) and next prime (1231010227).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1231010196 and 1231010205.

It is not an unprimeable number, because it can be changed into a prime (1231010227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3932784 + ... + 3933096.

It is an arithmetic number, because the mean of its divisors is an integer number (20177640).

Almost surely, 2^1231010220 is an apocalyptic number.

1231010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231010220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1937053440).

1231010220 is an abundant number, since it is smaller than the sum of its proper divisors (2643096660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231010220 is a wasteful number, since it uses less digits than its factorization.

1231010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1231010220 is about 35085.7552291525. The cubic root of 1231010220 is about 1071.7345204240.

Adding to 1231010220 its reverse (220101321), we get a palindrome (1451111541).

The spelling of 1231010220 in words is "one billion, two hundred thirty-one million, ten thousand, two hundred twenty".