21000021021331 has 8 divisors (see below), whose sum is σ = 22909185331200. Its totient is φ = 19090868626440.

The previous prime is 21000021021323. The next prime is 21000021021341. The reversal of 21000021021331 is 13312012000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000021021331 - 2³ = 21000021021323 is a prime.

It is a super-2 number, since 2×21000021021331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000021021341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929410 + ... + 6547048.

It is an arithmetic number, because the mean of its divisors is an integer number (2863648166400).

Almost surely, 2^{21000021021331} is an apocalyptic number.

21000021021331 is a deficient number, since it is larger than the sum of its proper divisors (1909164309869).

21000021021331 is a wasteful number, since it uses less digits than its factorization.

21000021021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957489.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21000021021331 its reverse (13312012000012), we get a palindrome (34312033021343).

The spelling of 21000021021331 in words is "twenty-one trillion, twenty-one million, twenty-one thousand, three hundred thirty-one".