21033020351431 has 8 divisors (see below), whose sum is σ = 22946756557824. Its totient is φ = 19119558052920.

The previous prime is 21033020351423. The next prime is 21033020351503. The reversal of 21033020351431 is 13415302033012.

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 21033020351431 - 2³ = 21033020351423 is a prime.

It is a super-2 number, since 2×21033020351431² (a number of 27 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 21033020351431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033020354431) 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, 68316391 + ... + 68623576.

It is an arithmetic number, because the mean of its divisors is an integer number (2868344569728).

Almost surely, 2^{21033020351431} is an apocalyptic number.

21033020351431 is a deficient number, since it is larger than the sum of its proper divisors (1913736206393).

21033020351431 is a wasteful number, since it uses less digits than its factorization.

21033020351431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136953941.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 21033020351431 its reverse (13415302033012), we get a palindrome (34448322384443).

The spelling of 21033020351431 in words is "twenty-one trillion, thirty-three billion, twenty million, three hundred fifty-one thousand, four hundred thirty-one".