22011972 has 24 divisors (see below), whose sum is σ = 52204992. Its totient is φ = 7216800.

The previous prime is 22011967. The next prime is 22012019. The reversal of 22011972 is 27911022.

It is a super-2 number, since 2×22011972² = 969053822657568, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14304 + ... + 15767.

It is an arithmetic number, because the mean of its divisors is an integer number (2175208).

Almost surely, 2^22011972 is an apocalyptic number.

It is an amenable number.

22011972 is an abundant number, since it is smaller than the sum of its proper divisors (30193020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22011972 is a wasteful number, since it uses less digits than its factorization.

22011972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30139 (or 30137 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 22011972 is about 4691.6918057349. The cubic root of 22011972 is about 280.2547511438.

Adding to 22011972 its reverse (27911022), we get a palindrome (49922994).

The spelling of 22011972 in words is "twenty-two million, eleven thousand, nine hundred seventy-two".