1231203221220 has 48 divisors (see below), whose sum is σ = 3939850309248. Its totient is φ = 281417879040.

The previous prime is 1231203221201. The next prime is 1231203221263. The reversal of 1231203221220 is 221223021321.

It is a super-2 number, since 2×1231203221220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1465717701 + ... + 1465718540.

It is an arithmetic number, because the mean of its divisors is an integer number (82080214776).

Almost surely, 2^{1231203221220} is an apocalyptic number.

1231203221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231203221220 is an abundant number, since it is smaller than the sum of its proper divisors (2708647088028).

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

1231203221220 is a wasteful number, since it uses less digits than its factorization.

1231203221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931436260 (or 2931436258 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1231203221220 its reverse (221223021321), we get a palindrome (1452426242541).

The spelling of 1231203221220 in words is "one trillion, two hundred thirty-one billion, two hundred three million, two hundred twenty-one thousand, two hundred twenty".