22121201012212 has 6 divisors (see below), whose sum is σ = 38712101771378. Its totient is φ = 11060600506104.

The previous prime is 22121201012149. The next prime is 22121201012221. The reversal of 22121201012212 is 21221010212122.

It can be written as a sum of positive squares in only one way, i.e., 17333533182736 + 4787667829476 = 4163356^2 + 2188074^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22121201012212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765150126523 + ... + 2765150126530.

Almost surely, 2^{22121201012212} is an apocalyptic number.

It is an amenable number.

22121201012212 is a deficient number, since it is larger than the sum of its proper divisors (16590900759166).

22121201012212 is a wasteful number, since it uses less digits than its factorization.

22121201012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530300253057 (or 5530300253055 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22121201012212 its reverse (21221010212122), we get a palindrome (43342211224334).

The spelling of 22121201012212 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred one million, twelve thousand, two hundred twelve".