22121200202021 has 4 divisors (see below), whose sum is σ = 22834787305344. Its totient is φ = 21407613098700.

The previous prime is 22121200201957. The next prime is 22121200202027. The reversal of 22121200202021 is 12020200212122.

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 22121200202021 - 2⁶ = 22121200201957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121200202027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356793551615 + ... + 356793551676.

It is an arithmetic number, because the mean of its divisors is an integer number (5708696826336).

Almost surely, 2^{22121200202021} is an apocalyptic number.

It is an amenable number.

22121200202021 is a deficient number, since it is larger than the sum of its proper divisors (713587103323).

22121200202021 is an equidigital number, since it uses as much as digits as its factorization.

22121200202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713587103322.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22121200202021 its reverse (12020200212122), we get a palindrome (34141400414143).

The spelling of 22121200202021 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred million, two hundred two thousand, twenty-one".