213551023 has 4 divisors (see below), whose sum is σ = 244058320. Its totient is φ = 183043728.

The previous prime is 213550979. The next prime is 213551053. The reversal of 213551023 is 320155312.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-213551023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213550985 and 213551003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213551053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15253638 + ... + 15253651.

It is an arithmetic number, because the mean of its divisors is an integer number (61014580).

Almost surely, 2^213551023 is an apocalyptic number.

213551023 is a deficient number, since it is larger than the sum of its proper divisors (30507297).

213551023 is an equidigital number, since it uses as much as digits as its factorization.

213551023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30507296.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 213551023 is about 14613.3850630167. The cubic root of 213551023 is about 597.7238045134.

The spelling of 213551023 in words is "two hundred thirteen million, five hundred fifty-one thousand, twenty-three".