21041876064 has 48 divisors (see below), whose sum is σ = 60256284480. Its totient is φ = 6376325760.

The previous prime is 21041876047. The next prime is 21041876083. The reversal of 21041876064 is 46067814012.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21041876064² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9961954 + ... + 9964065.

It is an arithmetic number, because the mean of its divisors is an integer number (1255339260).

Almost surely, 2^21041876064 is an apocalyptic number.

21041876064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21041876064 is an abundant number, since it is smaller than the sum of its proper divisors (39214408416).

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

21041876064 is a wasteful number, since it uses less digits than its factorization.

21041876064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19926043 (or 19926035 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 21041876064 in words is "twenty-one billion, forty-one million, eight hundred seventy-six thousand, sixty-four".