21735056907402 has 32 divisors (see below), whose sum is σ = 43983697944384. Its totient is φ = 7159880582400.

The previous prime is 21735056907367. The next prime is 21735056907407. The reversal of 21735056907402 is 20470965053712.

It is not an unprimeable number, because it can be changed into a prime (21735056907407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57181413 + ... + 57560264.

It is an arithmetic number, because the mean of its divisors is an integer number (1374490560762).

Almost surely, 2^{21735056907402} is an apocalyptic number.

21735056907402 is an abundant number, since it is smaller than the sum of its proper divisors (22248641036982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21735056907402 is a wasteful number, since it uses less digits than its factorization.

21735056907402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114742054.

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 21735056907402 in words is "twenty-one trillion, seven hundred thirty-five billion, fifty-six million, nine hundred seven thousand, four hundred two".