22021042251 has 16 divisors (see below), whose sum is σ = 31622651424. Its totient is φ = 13550256384.

The previous prime is 22021042217. The next prime is 22021042289. The reversal of 22021042251 is 15224012022.

It is not a de Polignac number, because 22021042251 - 2¹⁸ = 22020780107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22021042201) 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, 780055 + ... + 807791.

It is an arithmetic number, because the mean of its divisors is an integer number (1976415714).

Almost surely, 2^22021042251 is an apocalyptic number.

22021042251 is a deficient number, since it is larger than the sum of its proper divisors (9601609173).

22021042251 is a wasteful number, since it uses less digits than its factorization.

22021042251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48110.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 22021042251 its reverse (15224012022), we get a palindrome (37245054273).

The spelling of 22021042251 in words is "twenty-two billion, twenty-one million, forty-two thousand, two hundred fifty-one".