22012129978 has 8 divisors (see below), whose sum is σ = 33038746272. Its totient is φ = 10999214556.

The previous prime is 22012129973. The next prime is 22012130017. The reversal of 22012129978 is 87992121022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (22012129973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3421200 + ... + 3427627.

It is an arithmetic number, because the mean of its divisors is an integer number (4129843284).

Almost surely, 2^22012129978 is an apocalyptic number.

22012129978 is a deficient number, since it is larger than the sum of its proper divisors (11026616294).

22012129978 is a wasteful number, since it uses less digits than its factorization.

22012129978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850436.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 22012129978 in words is "twenty-two billion, twelve million, one hundred twenty-nine thousand, nine hundred seventy-eight".