19722131 has 18 divisors (see below), whose sum is σ = 23525748. Its totient is φ = 16389360.

The previous prime is 19722119. The next prime is 19722149. The reversal of 19722131 is 13122791.

It is not a de Polignac number, because 19722131 - 2⁶ = 19722067 is a prime.

It is a super-2 number, since 2×19722131² = 777924902362322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19722131.

It is not an unprimeable number, because it can be changed into a prime (19722161) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 191426 + ... + 191528.

It is an arithmetic number, because the mean of its divisors is an integer number (1306986).

Almost surely, 2^19722131 is an apocalyptic number.

19722131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19722131 is a deficient number, since it is larger than the sum of its proper divisors (3803617).

19722131 is a wasteful number, since it uses less digits than its factorization.

19722131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 127 counting only the distinct ones).

The product of its digits is 756, while the sum is 26.

The square root of 19722131 is about 4440.9605942859. The cubic root of 19722131 is about 270.1788070279.

The spelling of 19722131 in words is "nineteen million, seven hundred twenty-two thousand, one hundred thirty-one".