22001251491 has 12 divisors (see below), whose sum is σ = 31897728720. Its totient is φ = 14612973360.

The previous prime is 22001251487. The next prime is 22001251499. The reversal of 22001251491 is 19415210022.

It is not a de Polignac number, because 22001251491 - 2² = 22001251487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22001251499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4541415 + ... + 4546256.

It is an arithmetic number, because the mean of its divisors is an integer number (2658144060).

Almost surely, 2^22001251491 is an apocalyptic number.

22001251491 is a deficient number, since it is larger than the sum of its proper divisors (9896477229).

22001251491 is a wasteful number, since it uses less digits than its factorization.

22001251491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9087946 (or 9087943 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 22001251491 in words is "twenty-two billion, one million, two hundred fifty-one thousand, four hundred ninety-one".