22051978 has 16 divisors (see below), whose sum is σ = 36156960. Its totient is φ = 10025136.

The previous prime is 22051957. The next prime is 22051979. The reversal of 22051978 is 87915022.

It is not an unprimeable number, because it can be changed into a prime (22051979) by changing a digit.

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, 4588 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (2259810).

Almost surely, 2^22051978 is an apocalyptic number.

22051978 is a deficient number, since it is larger than the sum of its proper divisors (14104982).

22051978 is a wasteful number, since it uses less digits than its factorization.

22051978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12741.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 22051978 is about 4695.9533643340. The cubic root of 22051978 is about 280.4244328368.

The spelling of 22051978 in words is "twenty-two million, fifty-one thousand, nine hundred seventy-eight".