126221971922 has 6 divisors (see below), whose sum is σ = 189333711543. Its totient is φ = 63110734742.

The previous prime is 126221971907. The next prime is 126221971951. The reversal of 126221971922 is 229179122621.

It can be written as a sum of positive squares in only one way, i.e., 63110985961 + 63110985961 = 251219^2 + 251219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=251219.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 376829 + ... + 628047.

Almost surely, 2^126221971922 is an apocalyptic number.

126221971922 is a deficient number, since it is larger than the sum of its proper divisors (63111739621).

126221971922 is an frugal number, since it uses more digits than its factorization.

126221971922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502440 (or 251221 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The spelling of 126221971922 in words is "one hundred twenty-six billion, two hundred twenty-one million, nine hundred seventy-one thousand, nine hundred twenty-two".