21033400431 has 8 divisors (see below), whose sum is σ = 28292716080. Its totient is φ = 13898175872.

The previous prime is 21033400411. The next prime is 21033400481. The reversal of 21033400431 is 13400433012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033400431 is a prime.

It is a super-2 number, since 2×21033400431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21033400398 and 21033400407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033400411) 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, 31022376 + ... + 31023053.

It is an arithmetic number, because the mean of its divisors is an integer number (3536589510).

Almost surely, 2^21033400431 is an apocalyptic number.

21033400431 is a deficient number, since it is larger than the sum of its proper divisors (7259315649).

21033400431 is a wasteful number, since it uses less digits than its factorization.

21033400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62045545.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21033400431 its reverse (13400433012), we get a palindrome (34433833443).

The spelling of 21033400431 in words is "twenty-one billion, thirty-three million, four hundred thousand, four hundred thirty-one".