213131221230021 has 8 divisors (see below), whose sum is σ = 284213852453664. Its totient is φ = 142068035413200.

The previous prime is 213131221229981. The next prime is 213131221230049. The reversal of 213131221230021 is 120032122131312.

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

It is not a de Polignac number, because 213131221230021 - 2¹⁵ = 213131221197253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213131221229973 and 213131221230000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131221230121) 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, 4861326130 + ... + 4861369971.

It is an arithmetic number, because the mean of its divisors is an integer number (35526731556708).

Almost surely, 2^{213131221230021} is an apocalyptic number.

It is an amenable number.

213131221230021 is a deficient number, since it is larger than the sum of its proper divisors (71082631223643).

213131221230021 is an equidigital number, since it uses as much as digits as its factorization.

213131221230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9722703411.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 213131221230021 its reverse (120032122131312), we get a palindrome (333163343361333).

The spelling of 213131221230021 in words is "two hundred thirteen trillion, one hundred thirty-one billion, two hundred twenty-one million, two hundred thirty thousand, twenty-one".