201019191900 has 36 divisors (see below), whose sum is σ = 581615529432. Its totient is φ = 53605117760.

The previous prime is 201019191883. The next prime is 201019191913. The reversal of 201019191900 is 9191910102.

It is a super-2 number, since 2×201019191900² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335031687 + ... + 335032286.

Almost surely, 2^201019191900 is an apocalyptic number.

201019191900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201019191900 is an abundant number, since it is smaller than the sum of its proper divisors (380596337532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201019191900 is a wasteful number, since it uses less digits than its factorization.

201019191900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670063990 (or 670063983 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 201019191900 in words is "two hundred one billion, nineteen million, one hundred ninety-one thousand, nine hundred".