213621970 has 8 divisors (see below), whose sum is σ = 384519564. Its totient is φ = 85448784.

The previous prime is 213621913. The next prime is 213621971. The reversal of 213621970 is 79126312.

It can be written as a sum of positive squares in 2 ways, for example, as 202123089 + 11498881 = 14217^2 + 3391^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213621971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10681089 + ... + 10681108.

Almost surely, 2^213621970 is an apocalyptic number.

213621970 is a deficient number, since it is larger than the sum of its proper divisors (170897594).

213621970 is a wasteful number, since it uses less digits than its factorization.

213621970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21362204.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 213621970 is about 14615.8123277497. The cubic root of 213621970 is about 597.7899901254.

It can be divided in two parts, 21362 and 1970, that added together give a palindrome (23332).

The spelling of 213621970 in words is "two hundred thirteen million, six hundred twenty-one thousand, nine hundred seventy".