21755234035506 has 16 divisors (see below), whose sum is σ = 43539611068224. Its totient is φ = 7246887512304.

The previous prime is 21755234035477. The next prime is 21755234035537. The reversal of 21755234035506 is 60553043255712.

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, 1214281846 + ... + 1214299761.

It is an arithmetic number, because the mean of its divisors is an integer number (2721225691764).

Almost surely, 2^{21755234035506} is an apocalyptic number.

21755234035506 is an abundant number, since it is smaller than the sum of its proper divisors (21784377032718).

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

21755234035506 is a wasteful number, since it uses less digits than its factorization.

21755234035506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428583105.

The product of its (nonzero) digits is 3780000, while the sum is 48.

The spelling of 21755234035506 in words is "twenty-one trillion, seven hundred fifty-five billion, two hundred thirty-four million, thirty-five thousand, five hundred six".