19988321402 has 16 divisors (see below), whose sum is σ = 34267938432. Its totient is φ = 8565862320.

The previous prime is 19988321399. The next prime is 19988321443. The reversal of 19988321402 is 20412388991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231827 + ... + 306137.

It is an arithmetic number, because the mean of its divisors is an integer number (2141746152).

Almost surely, 2^19988321402 is an apocalyptic number.

19988321402 is a deficient number, since it is larger than the sum of its proper divisors (14279617030).

19988321402 is a wasteful number, since it uses less digits than its factorization.

19988321402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93533.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 19988321402 in words is "nineteen billion, nine hundred eighty-eight million, three hundred twenty-one thousand, four hundred two".