21880889534 has 24 divisors (see below), whose sum is σ = 38188302768. Its totient is φ = 9375465120.

The previous prime is 21880889519. The next prime is 21880889561. The reversal of 21880889534 is 43598808812.

It is a happy number.

It is a super-2 number, since 2×21880889534² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21880889534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475967 + ... + 519909.

It is an arithmetic number, because the mean of its divisors is an integer number (1591179282).

Almost surely, 2^21880889534 is an apocalyptic number.

21880889534 is a deficient number, since it is larger than the sum of its proper divisors (16307413234).

21880889534 is a wasteful number, since it uses less digits than its factorization.

21880889534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49040 (or 49033 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 21880889534 in words is "twenty-one billion, eight hundred eighty million, eight hundred eighty-nine thousand, five hundred thirty-four".