22372721 has 16 divisors (see below), whose sum is σ = 27033600. Its totient is φ = 18100368.

The previous prime is 22372703. The next prime is 22372723. The reversal of 22372721 is 12727322.

22372721 = T₂₀₀ + T₂₀₁ + ... + T₅₂₁.

It is a cyclic number.

It is not a de Polignac number, because 22372721 - 2¹⁴ = 22356337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22372723) 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, 11840 + ... + 13598.

It is an arithmetic number, because the mean of its divisors is an integer number (1689600).

Almost surely, 2^22372721 is an apocalyptic number.

It is an amenable number.

22372721 is a deficient number, since it is larger than the sum of its proper divisors (4660879).

22372721 is a wasteful number, since it uses less digits than its factorization.

22372721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its digits is 2352, while the sum is 26.

The square root of 22372721 is about 4729.9810781863. The cubic root of 22372721 is about 281.7774722863. Note that the first 3 decimals are identical.

The spelling of 22372721 in words is "twenty-two million, three hundred seventy-two thousand, seven hundred twenty-one".