213012020111021 has 4 divisors (see below), whose sum is σ = 213039473659200. Its totient is φ = 212984566562844.

The previous prime is 213012020110999. The next prime is 213012020111041. The reversal of 213012020111021 is 120111020210312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213012020111021 - 2³⁸ = 212737142204077 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 (213012020111041) 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, 13726762451 + ... + 13726777968.

It is an arithmetic number, because the mean of its divisors is an integer number (53259868414800).

Almost surely, 2^{213012020111021} is an apocalyptic number.

It is an amenable number.

213012020111021 is a deficient number, since it is larger than the sum of its proper divisors (27453548179).

213012020111021 is an equidigital number, since it uses as much as digits as its factorization.

213012020111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27453548178.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 213012020111021 its reverse (120111020210312), we get a palindrome (333123040321333).

The spelling of 213012020111021 in words is "two hundred thirteen trillion, twelve billion, twenty million, one hundred eleven thousand, twenty-one".