213698421 has 24 divisors (see below), whose sum is σ = 317906784. Its totient is φ = 138227040.

The previous prime is 213698411. The next prime is 213698467. The reversal of 213698421 is 124896312.

It is not a de Polignac number, because 213698421 - 2⁵ = 213698389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213698411) 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 23 ways as a sum of consecutive naturals, for example, 162850 + ... + 164156.

It is an arithmetic number, because the mean of its divisors is an integer number (13246116).

Almost surely, 2^213698421 is an apocalyptic number.

It is an amenable number.

213698421 is a deficient number, since it is larger than the sum of its proper divisors (104208363).

213698421 is a wasteful number, since it uses less digits than its factorization.

213698421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841 (or 1838 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 213698421 is about 14618.4274462064. The cubic root of 213698421 is about 597.8612939520.

The spelling of 213698421 in words is "two hundred thirteen million, six hundred ninety-eight thousand, four hundred twenty-one".