21932101 has 4 divisors (see below), whose sum is σ = 21954604. Its totient is φ = 21909600.

The previous prime is 21932077. The next prime is 21932143. The reversal of 21932101 is 10123912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14364100 + 7568001 = 3790^2 + 2751^2 .

It is a cyclic number.

It is not a de Polignac number, because 21932101 - 2¹⁵ = 21899333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21932161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9720 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (5488651).

Almost surely, 2^21932101 is an apocalyptic number.

It is an amenable number.

21932101 is a deficient number, since it is larger than the sum of its proper divisors (22503).

21932101 is a wasteful number, since it uses less digits than its factorization.

21932101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22502.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21932101 is about 4683.1721087314. The cubic root of 21932101 is about 279.9153698312.

The spelling of 21932101 in words is "twenty-one million, nine hundred thirty-two thousand, one hundred one".