213620021 has 8 divisors (see below), whose sum is σ = 234640320. Its totient is φ = 193577472.

The previous prime is 213619999. The next prime is 213620047. The reversal of 213620021 is 120026312.

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

It is not a de Polignac number, because 213620021 - 2⁶ = 213619957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213620081) 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, 243980 + ... + 244853.

It is an arithmetic number, because the mean of its divisors is an integer number (29330040).

Almost surely, 2^213620021 is an apocalyptic number.

It is an amenable number.

213620021 is a deficient number, since it is larger than the sum of its proper divisors (21020299).

213620021 is a wasteful number, since it uses less digits than its factorization.

213620021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488875.

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

The square root of 213620021 is about 14615.7456532330. The cubic root of 213620021 is about 597.7881721223.

Adding to 213620021 its reverse (120026312), we get a palindrome (333646333).

The spelling of 213620021 in words is "two hundred thirteen million, six hundred twenty thousand, twenty-one".