21183020090 has 16 divisors (see below), whose sum is σ = 38163837960. Its totient is φ = 8465563200.

The previous prime is 21183020087. The next prime is 21183020123. The reversal of 21183020090 is 9002038112.

It can be written as a sum of positive squares in 4 ways, for example, as 6293407561 + 14889612529 = 79331^2 + 122023^2 .

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, 943961 + ... + 966140.

Almost surely, 2^21183020090 is an apocalyptic number.

21183020090 is a deficient number, since it is larger than the sum of its proper divisors (16980817870).

21183020090 is a wasteful number, since it uses less digits than its factorization.

21183020090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911217.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21183020090 in words is "twenty-one billion, one hundred eighty-three million, twenty thousand, ninety".