21873701 has 4 divisors (see below), whose sum is σ = 21894912. Its totient is φ = 21852492.

The previous prime is 21873673. The next prime is 21873707. The reversal of 21873701 is 10737812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21873701 - 2⁶ = 21873637 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 (21873707) 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, 8975 + ... + 11148.

It is an arithmetic number, because the mean of its divisors is an integer number (5473728).

Almost surely, 2^21873701 is an apocalyptic number.

It is an amenable number.

21873701 is a deficient number, since it is larger than the sum of its proper divisors (21211).

21873701 is a wasteful number, since it uses less digits than its factorization.

21873701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21210.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 21873701 is about 4676.9328624645. The cubic root of 21873701 is about 279.6666994986. Note that the first 4 decimals are identical.

The spelling of 21873701 in words is "twenty-one million, eight hundred seventy-three thousand, seven hundred one".