31001421660 has 192 divisors, whose sum is σ = 101122560000. Its totient is φ = 7022131200.

The previous prime is 31001421593. The next prime is 31001421667. The reversal of 31001421660 is 6612410013.

It is a super-2 number, since 2×31001421660² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31001421660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001421667) 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, 567216 + ... + 619464.

It is an arithmetic number, because the mean of its divisors is an integer number (526680000).

Almost surely, 2^31001421660 is an apocalyptic number.

31001421660 is a gapful number since it is divisible by the number (30) 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 31001421660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50561280000).

31001421660 is an abundant number, since it is smaller than the sum of its proper divisors (70121138340).

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

31001421660 is a wasteful number, since it uses less digits than its factorization.

31001421660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52332 (or 52330 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31001421660 its reverse (6612410013), we get a palindrome (37613831673).

The spelling of 31001421660 in words is "thirty-one billion, one million, four hundred twenty-one thousand, six hundred sixty".