21223513131 has 16 divisors (see below), whose sum is σ = 29072736000. Its totient is φ = 13761910368.

The previous prime is 21223513121. The next prime is 21223513169. The reversal of 21223513131 is 13131532212.

It is a happy number.

It is not a de Polignac number, because 21223513131 - 2²³ = 21215124523 is a prime.

It is a super-2 number, since 2×21223513131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21223513121) 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, 310720 + ... + 372818.

It is an arithmetic number, because the mean of its divisors is an integer number (1817046000).

Almost surely, 2^21223513131 is an apocalyptic number.

21223513131 is a deficient number, since it is larger than the sum of its proper divisors (7849222869).

21223513131 is a wasteful number, since it uses less digits than its factorization.

21223513131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65218.

The product of its digits is 1080, while the sum is 24.

The spelling of 21223513131 in words is "twenty-one billion, two hundred twenty-three million, five hundred thirteen thousand, one hundred thirty-one".