22001251 has 12 divisors (see below), whose sum is σ = 22973448. Its totient is φ = 21065184.

The previous prime is 22001237. The next prime is 22001261. The reversal of 22001251 is 15210022.

It is not a de Polignac number, because 22001251 - 2¹⁵ = 21968483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134896 + ... + 135058.

It is an arithmetic number, because the mean of its divisors is an integer number (1914454).

Almost surely, 2^22001251 is an apocalyptic number.

22001251 is a deficient number, since it is larger than the sum of its proper divisors (972197).

22001251 is an equidigital number, since it uses as much as digits as its factorization.

22001251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 22001251 is about 4690.5491149758. The cubic root of 22001251 is about 280.2092441031.

Adding to 22001251 its reverse (15210022), we get a palindrome (37211273).

The spelling of 22001251 in words is "twenty-two million, one thousand, two hundred fifty-one".