21216044041020 has 144 divisors (see below), whose sum is σ = 64499689249632. Its totient is φ = 5644935406080.

The previous prime is 21216044041019. The next prime is 21216044041063. The reversal of 21216044041020 is 2014044061212.

21216044041020 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 604 + 40 + 4 + 10 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144407719 + ... + 144554561.

It is an arithmetic number, because the mean of its divisors is an integer number (447914508678).

Almost surely, 2^{21216044041020} is an apocalyptic number.

21216044041020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21216044041020 is an abundant number, since it is smaller than the sum of its proper divisors (43283645208612).

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

21216044041020 is a wasteful number, since it uses less digits than its factorization.

21216044041020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148652 (or 148647 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The spelling of 21216044041020 in words is "twenty-one trillion, two hundred sixteen billion, forty-four million, forty-one thousand, twenty".