21040100331 has 4 divisors (see below), whose sum is σ = 28053467112. Its totient is φ = 14026733552.

The previous prime is 21040100309. The next prime is 21040100381. The reversal of 21040100331 is 13300104012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21040100331 - 2⁵ = 21040100299 is a prime.

It is a super-2 number, since 2×21040100331² (a number of 21 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 21040100331.

It is not an unprimeable number, because it can be changed into a prime (21040100381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506683386 + ... + 3506683391.

It is an arithmetic number, because the mean of its divisors is an integer number (7013366778).

Almost surely, 2^21040100331 is an apocalyptic number.

21040100331 is a deficient number, since it is larger than the sum of its proper divisors (7013366781).

21040100331 is an equidigital number, since it uses as much as digits as its factorization.

21040100331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013366780.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21040100331 its reverse (13300104012), we get a palindrome (34340204343).

The spelling of 21040100331 in words is "twenty-one billion, forty million, one hundred thousand, three hundred thirty-one".