22120209938978 has 4 divisors (see below), whose sum is σ = 33180314908470. Its totient is φ = 11060104969488.

The previous prime is 22120209938977. The next prime is 22120209938993. The reversal of 22120209938978 is 87983990202122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14450284630609 + 7669925308369 = 3801353^2 + 2769463^2 .

It is a super-2 number, since 2×22120209938978² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22120209938978.

It is not an unprimeable number, because it can be changed into a prime (22120209938977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5530052484743 + ... + 5530052484746.

Almost surely, 2^{22120209938978} is an apocalyptic number.

22120209938978 is a deficient number, since it is larger than the sum of its proper divisors (11060104969492).

22120209938978 is a wasteful number, since it uses less digits than its factorization.

22120209938978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060104969491.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 22120209938978 in words is "twenty-two trillion, one hundred twenty billion, two hundred nine million, nine hundred thirty-eight thousand, nine hundred seventy-eight".