21650514402 has 64 divisors (see below), whose sum is σ = 50466009600. Its totient is φ = 6122666880.

The previous prime is 21650514337. The next prime is 21650514409. The reversal of 21650514402 is 20441505612.

It is a self number, because there is not a number n which added to its sum of digits gives 21650514402.

It is not an unprimeable number, because it can be changed into a prime (21650514409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44827 + ... + 212862.

It is an arithmetic number, because the mean of its divisors is an integer number (788531400).

Almost surely, 2^21650514402 is an apocalyptic number.

21650514402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21650514402 is an abundant number, since it is smaller than the sum of its proper divisors (28815495198).

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

21650514402 is a wasteful number, since it uses less digits than its factorization.

21650514402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257791.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21650514402 in words is "twenty-one billion, six hundred fifty million, five hundred fourteen thousand, four hundred two".