213211012030021 has 4 divisors (see below), whose sum is σ = 213211148399500. Its totient is φ = 213210875660544.

The previous prime is 213211012030001. The next prime is 213211012030031. The reversal of 213211012030021 is 120030210112312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86610011602500 + 126601000427521 = 9306450^2 + 11251711^2 .

It is a cyclic number.

It is not a de Polignac number, because 213211012030021 - 2²⁹ = 213210475159109 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 (213211012030001) 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, 65811996 + ... + 68975653.

It is an arithmetic number, because the mean of its divisors is an integer number (53302787099875).

Almost surely, 2^{213211012030021} is an apocalyptic number.

It is an amenable number.

213211012030021 is a deficient number, since it is larger than the sum of its proper divisors (136369479).

213211012030021 is a wasteful number, since it uses less digits than its factorization.

213211012030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136369478.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213211012030021 its reverse (120030210112312), we get a palindrome (333241222142333).

The spelling of 213211012030021 in words is "two hundred thirteen trillion, two hundred eleven billion, twelve million, thirty thousand, twenty-one".