223146136521 has 64 divisors (see below), whose sum is σ = 412633589760. Its totient is φ = 115786946880.

The previous prime is 223146136487. The next prime is 223146136541. The reversal of 223146136521 is 125631641322.

223146136521 is a `hidden beast` number, since 2 + 2 + 3 + 14 + 613 + 6 + 5 + 21 = 666.

It is not a de Polignac number, because 223146136521 - 2¹⁷ = 223146005449 is a prime.

It is a super-3 number, since 3×223146136521³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (223146136541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1762090 + ... + 1884476.

It is an arithmetic number, because the mean of its divisors is an integer number (6447399840).

Almost surely, 2^223146136521 is an apocalyptic number.

223146136521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

223146136521 is a deficient number, since it is larger than the sum of its proper divisors (189487453239).

223146136521 is a wasteful number, since it uses less digits than its factorization.

223146136521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123291 (or 123285 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

Adding to 223146136521 its reverse (125631641322), we get a palindrome (348777777843).

The spelling of 223146136521 in words is "two hundred twenty-three billion, one hundred forty-six million, one hundred thirty-six thousand, five hundred twenty-one".