21705444534 has 16 divisors (see below), whose sum is σ = 43445384640. Its totient is φ = 7229398920.

The previous prime is 21705444529. The next prime is 21705444581. The reversal of 21705444534 is 43544450712.

It is a super-2 number, since 2×21705444534² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21705444492 and 21705444501.

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, 1429132 + ... + 1444239.

It is an arithmetic number, because the mean of its divisors is an integer number (2715336540).

Almost surely, 2^21705444534 is an apocalyptic number.

21705444534 is an abundant number, since it is smaller than the sum of its proper divisors (21739940106).

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

21705444534 is a wasteful number, since it uses less digits than its factorization.

21705444534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874635.

The product of its (nonzero) digits is 268800, while the sum is 39.

The spelling of 21705444534 in words is "twenty-one billion, seven hundred five million, four hundred forty-four thousand, five hundred thirty-four".