21905355702 has 32 divisors (see below), whose sum is σ = 46155870720. Its totient is φ = 6911580960.

The previous prime is 21905355691. The next prime is 21905355707. The reversal of 21905355702 is 20755350912.

It is a super-2 number, since 2×21905355702² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21905355707) 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, 53283 + ... + 215985.

It is an arithmetic number, because the mean of its divisors is an integer number (1442370960).

Almost surely, 2^21905355702 is an apocalyptic number.

21905355702 is an abundant number, since it is smaller than the sum of its proper divisors (24250515018).

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

21905355702 is a wasteful number, since it uses less digits than its factorization.

21905355702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163908.

The product of its (nonzero) digits is 94500, while the sum is 39.

The spelling of 21905355702 in words is "twenty-one billion, nine hundred five million, three hundred fifty-five thousand, seven hundred two".