19927021402 has 32 divisors (see below), whose sum is σ = 32208367104. Its totient is φ = 9227649600.

The previous prime is 19927021369. The next prime is 19927021403. The reversal of 19927021402 is 20412072991.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (19927021403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68733 + ... + 211135.

It is an arithmetic number, because the mean of its divisors is an integer number (1006511472).

Almost surely, 2^19927021402 is an apocalyptic number.

19927021402 is a deficient number, since it is larger than the sum of its proper divisors (12281345702).

19927021402 is a wasteful number, since it uses less digits than its factorization.

19927021402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142534.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 19927021402 in words is "nineteen billion, nine hundred twenty-seven million, twenty-one thousand, four hundred two".