213122202021 has 24 divisors (see below), whose sum is σ = 318698964480. Its totient is φ = 137078506656.

The previous prime is 213122201969. The next prime is 213122202037. The reversal of 213122202021 is 120202221312.

It is not a de Polignac number, because 213122202021 - 2¹⁷ = 213122070949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213122201985 and 213122202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213122202061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38676 + ... + 654018.

It is an arithmetic number, because the mean of its divisors is an integer number (13279123520).

Almost surely, 2^213122202021 is an apocalyptic number.

It is an amenable number.

213122202021 is a deficient number, since it is larger than the sum of its proper divisors (105576762459).

213122202021 is a wasteful number, since it uses less digits than its factorization.

213122202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616705 (or 616702 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 213122202021 its reverse (120202221312), we get a palindrome (333324423333).

The spelling of 213122202021 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred two thousand, twenty-one".