21032591890 has 32 divisors (see below), whose sum is σ = 38003831424. Its totient is φ = 8380842240.

The previous prime is 21032591887. The next prime is 21032591941. The reversal of 21032591890 is 9819523012.

It is a super-2 number, since 2×21032591890² (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 15 ways as a sum of consecutive naturals, for example, 3018010 + ... + 3024970.

It is an arithmetic number, because the mean of its divisors is an integer number (1187619732).

Almost surely, 2^21032591890 is an apocalyptic number.

21032591890 is a deficient number, since it is larger than the sum of its proper divisors (16971239534).

21032591890 is a wasteful number, since it uses less digits than its factorization.

21032591890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8082.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21032591890 in words is "twenty-one billion, thirty-two million, five hundred ninety-one thousand, eight hundred ninety".