21022032091 has 16 divisors (see below), whose sum is σ = 22640200704. Its totient is φ = 19447553664.

The previous prime is 21022032067. The next prime is 21022032107. The reversal of 21022032091 is 19023022012.

It is a cyclic number.

It is not a de Polignac number, because 21022032091 - 2²¹ = 21019934939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022032061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507426 + ... + 547288.

It is an arithmetic number, because the mean of its divisors is an integer number (1415012544).

Almost surely, 2^21022032091 is an apocalyptic number.

21022032091 is a deficient number, since it is larger than the sum of its proper divisors (1618168613).

21022032091 is a wasteful number, since it uses less digits than its factorization.

21022032091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40410.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 21022032091 in words is "twenty-one billion, twenty-two million, thirty-two thousand, ninety-one".