22121210021 has 8 divisors (see below), whose sum is σ = 22604300544. Its totient is φ = 21638637360.

The previous prime is 22121210011. The next prime is 22121210057. The reversal of 22121210021 is 12001212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22121210021 - 2¹⁴ = 22121193637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121209978 and 22121210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121210011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42470 + ... + 214583.

It is an arithmetic number, because the mean of its divisors is an integer number (2825537568).

Almost surely, 2^22121210021 is an apocalyptic number.

It is an amenable number.

22121210021 is a deficient number, since it is larger than the sum of its proper divisors (483090523).

22121210021 is a wasteful number, since it uses less digits than its factorization.

22121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258931.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22121210021 its reverse (12001212122), we get a palindrome (34122422143).

The spelling of 22121210021 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".