22212121210021 has 4 divisors (see below), whose sum is σ = 22212193330944. Its totient is φ = 22212049089100.

The previous prime is 22212121210009. The next prime is 22212121210043. The reversal of 22212121210021 is 12001212121222.

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 22212121210021 - 2¹⁷ = 22212121078949 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 (22212121240021) 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, 35596495 + ... + 36215116.

It is an arithmetic number, because the mean of its divisors is an integer number (5553048332736).

Almost surely, 2^{22212121210021} is an apocalyptic number.

It is an amenable number.

22212121210021 is a deficient number, since it is larger than the sum of its proper divisors (72120923).

22212121210021 is an equidigital number, since it uses as much as digits as its factorization.

22212121210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72120922.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22212121210021 its reverse (12001212121222), we get a palindrome (34213333331243).

The spelling of 22212121210021 in words is "twenty-two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".