22121220212021 has 16 divisors (see below), whose sum is σ = 25340366592000. Its totient is φ = 18916825740288.

The previous prime is 22121220211973. The next prime is 22121220212027. The reversal of 22121220212021 is 12021202212122.

It is not a de Polignac number, because 22121220212021 - 2⁶ = 22121220211957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121220211984 and 22121220212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121220212027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29898476 + ... + 30629418.

It is an arithmetic number, because the mean of its divisors is an integer number (1583772912000).

Almost surely, 2^{22121220212021} is an apocalyptic number.

It is an amenable number.

22121220212021 is a deficient number, since it is larger than the sum of its proper divisors (3219146379979).

22121220212021 is an equidigital number, since it uses as much as digits as its factorization.

22121220212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741028.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22121220212021 its reverse (12021202212122), we get a palindrome (34142422424143).

The spelling of 22121220212021 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, twenty-one".