21663603044034 has 32 divisors (see below), whose sum is σ = 49528401094656. Its totient is φ = 6188151602640.

The previous prime is 21663603044023. The next prime is 21663603044047. The reversal of 21663603044034 is 43044030636612.

It is a happy number.

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, 60204612 + ... + 60563375.

It is an arithmetic number, because the mean of its divisors is an integer number (1547762534208).

Almost surely, 2^{21663603044034} is an apocalyptic number.

21663603044034 is an abundant number, since it is smaller than the sum of its proper divisors (27864798050622).

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

21663603044034 is a wasteful number, since it uses less digits than its factorization.

21663603044034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120772270.

The product of its (nonzero) digits is 746496, while the sum is 42.

The spelling of 21663603044034 in words is "twenty-one trillion, six hundred sixty-three billion, six hundred three million, forty-four thousand, thirty-four".