22121011121021 has 4 divisors (see below), whose sum is σ = 22718876286492. Its totient is φ = 21523145955552.

The previous prime is 22121011120997. The next prime is 22121011121063. The reversal of 22121011121021 is 12012111012122.

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 8574091704025 + 13546919416996 = 2928155^2 + 3680614^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121011121021 - 2¹⁴ = 22121011104637 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 (22121011121081) 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, 298932582680 + ... + 298932582753.

It is an arithmetic number, because the mean of its divisors is an integer number (5679719071623).

Almost surely, 2^{22121011121021} is an apocalyptic number.

It is an amenable number.

22121011121021 is a deficient number, since it is larger than the sum of its proper divisors (597865165471).

22121011121021 is an equidigital number, since it uses as much as digits as its factorization.

22121011121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597865165470.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 22121011121021 its reverse (12012111012122), we get a palindrome (34133122133143).

The spelling of 22121011121021 in words is "twenty-two trillion, one hundred twenty-one billion, eleven million, one hundred twenty-one thousand, twenty-one".