21889016905522 has 32 divisors (see below), whose sum is σ = 35685969525360. Its totient is φ = 10009267511040.

The previous prime is 21889016905507. The next prime is 21889016905549. The reversal of 21889016905522 is 22550961098812.

It can be written as a sum of positive squares in 8 ways, for example, as 1040030792761 + 20848986112761 = 1019819^2 + 4566069^2 .

It is a super-2 number, since 2×21889016905522² (a number of 27 digits) contains 22 as substring.

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, 43315872 + ... + 43818292.

Almost surely, 2^{21889016905522} is an apocalyptic number.

21889016905522 is a deficient number, since it is larger than the sum of its proper divisors (13796952619838).

21889016905522 is a wasteful number, since it uses less digits than its factorization.

21889016905522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517918.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 21889016905522 in words is "twenty-one trillion, eight hundred eighty-nine billion, sixteen million, nine hundred five thousand, five hundred twenty-two".