21288959994 has 16 divisors (see below), whose sum is σ = 42580594368. Its totient is φ = 7095874272.

The previous prime is 21288959987. The next prime is 21288960013. The reversal of 21288959994 is 49995988212.

It is a super-2 number, since 2×21288959994² (a number of 21 digits) contains 22 as substring.

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, 739 + ... + 206345.

It is an arithmetic number, because the mean of its divisors is an integer number (2661287148).

Almost surely, 2^21288959994 is an apocalyptic number.

21288959994 is an abundant number, since it is smaller than the sum of its proper divisors (21291634374).

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

21288959994 is a wasteful number, since it uses less digits than its factorization.

21288959994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222869.

The product of its digits is 33592320, while the sum is 66.

The spelling of 21288959994 in words is "twenty-one billion, two hundred eighty-eight million, nine hundred fifty-nine thousand, nine hundred ninety-four".