21401620106624 has 32 divisors (see below), whose sum is σ = 42636287438040. Its totient is φ = 10700747965440.

The previous prime is 21401620106609. The next prime is 21401620106627. The reversal of 21401620106624 is 42660102610412.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401620106627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28315772 + ... + 29061764.

Almost surely, 2^{21401620106624} is an apocalyptic number.

It is an amenable number.

21401620106624 is a deficient number, since it is larger than the sum of its proper divisors (21234667331416).

21401620106624 is an equidigital number, since it uses as much as digits as its factorization.

21401620106624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970138 (or 970126 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 21401620106624 in words is "twenty-one trillion, four hundred one billion, six hundred twenty million, one hundred six thousand, six hundred twenty-four".