213421031 has 8 divisors (see below), whose sum is σ = 223280064. Its totient is φ = 203783680.

The previous prime is 213421027. The next prime is 213421037. The reversal of 213421031 is 130124312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213421031 - 2² = 213421027 is a prime.

It is a super-2 number, since 2×213421031² = 91097072946205922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213421037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53450 + ... + 57303.

It is an arithmetic number, because the mean of its divisors is an integer number (27910008).

Almost surely, 2^213421031 is an apocalyptic number.

213421031 is a deficient number, since it is larger than the sum of its proper divisors (9859033).

213421031 is a wasteful number, since it uses less digits than its factorization.

213421031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110841.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 213421031 is about 14608.9366827295. The cubic root of 213421031 is about 597.6024984782.

Adding to 213421031 its reverse (130124312), we get a palindrome (343545343).

The spelling of 213421031 in words is "two hundred thirteen million, four hundred twenty-one thousand, thirty-one".