213521814 has 24 divisors (see below), whose sum is σ = 504688392. Its totient is φ = 64703520.

The previous prime is 213521807. The next prime is 213521821. The reversal of 213521814 is 418125312.

213521814 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213521807) and next prime (213521821).

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, 538999 + ... + 539394.

It is an arithmetic number, because the mean of its divisors is an integer number (21028683).

Almost surely, 2^213521814 is an apocalyptic number.

213521814 is an abundant number, since it is smaller than the sum of its proper divisors (291166578).

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

213521814 is a wasteful number, since it uses less digits than its factorization.

213521814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078412 (or 1078409 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 213521814 is about 14612.3856368493. The cubic root of 213521814 is about 597.6965515250.

The spelling of 213521814 in words is "two hundred thirteen million, five hundred twenty-one thousand, eight hundred fourteen".