19921011902 has 48 divisors (see below), whose sum is σ = 33542008416. Its totient is φ = 8864697600.

The previous prime is 19921011889. The next prime is 19921011907. The reversal of 19921011902 is 20911012991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921011907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2416127 + ... + 2424357.

It is an arithmetic number, because the mean of its divisors is an integer number (698791842).

Almost surely, 2^19921011902 is an apocalyptic number.

19921011902 is a deficient number, since it is larger than the sum of its proper divisors (13620996514).

19921011902 is a wasteful number, since it uses less digits than its factorization.

19921011902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465 (or 8454 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 35.

It can be divided in two parts, 199210 and 11902, that added together give a palindrome (211112).

The spelling of 19921011902 in words is "nineteen billion, nine hundred twenty-one million, eleven thousand, nine hundred two".