21035791456 has 12 divisors (see below), whose sum is σ = 41414214492. Its totient is φ = 10517895712.

The previous prime is 21035791453. The next prime is 21035791459. The reversal of 21035791456 is 65419753012.

It is an interprime number because it is at equal distance from previous prime (21035791453) and next prime (21035791459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035791453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328684210 + ... + 328684273.

It is an arithmetic number, because the mean of its divisors is an integer number (3451184541).

Almost surely, 2^21035791456 is an apocalyptic number.

It is an amenable number.

21035791456 is a deficient number, since it is larger than the sum of its proper divisors (20378423036).

21035791456 is an equidigital number, since it uses as much as digits as its factorization.

21035791456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657368493 (or 657368485 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 21035791456 in words is "twenty-one billion, thirty-five million, seven hundred ninety-one thousand, four hundred fifty-six".