19402171924 has 6 divisors (see below), whose sum is σ = 33953800874. Its totient is φ = 9701085960.

The previous prime is 19402171913. The next prime is 19402171933. The reversal of 19402171924 is 42917120491.

It can be written as a sum of positive squares in only one way, i.e., 15470881924 + 3931290000 = 124382^2 + 62700^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2425271487 + ... + 2425271494.

Almost surely, 2^19402171924 is an apocalyptic number.

It is an amenable number.

19402171924 is a deficient number, since it is larger than the sum of its proper divisors (14551628950).

19402171924 is a wasteful number, since it uses less digits than its factorization.

19402171924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850542985 (or 4850542983 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 19402171924 in words is "nineteen billion, four hundred two million, one hundred seventy-one thousand, nine hundred twenty-four".