21730835616 has 96 divisors (see below), whose sum is σ = 69027396480. Its totient is φ = 5843582976.

The previous prime is 21730835603. The next prime is 21730835641. The reversal of 21730835616 is 61653803712.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21730835616² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939681 + ... + 962528.

It is an arithmetic number, because the mean of its divisors is an integer number (719035380).

Almost surely, 2^21730835616 is an apocalyptic number.

It is an amenable number.

21730835616 is an abundant number, since it is smaller than the sum of its proper divisors (47296560864).

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

21730835616 is a wasteful number, since it uses less digits than its factorization.

21730835616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902246 (or 1902238 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21730835616 in words is "twenty-one billion, seven hundred thirty million, eight hundred thirty-five thousand, six hundred sixteen".