22121221013 has 2 divisors, whose sum is σ = 22121221014. Its totient is φ = 22121221012.

The previous prime is 22121221009. The next prime is 22121221021. The reversal of 22121221013 is 31012212122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21977173009 + 144048004 = 148247^2 + 12002^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121221013 - 2² = 22121221009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121220982 and 22121221000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121221033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060610506 + 11060610507.

It is an arithmetic number, because the mean of its divisors is an integer number (11060610507).

Almost surely, 2^22121221013 is an apocalyptic number.

It is an amenable number.

22121221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121221013 is an equidigital number, since it uses as much as digits as its factorization.

22121221013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 22121221013 its reverse (31012212122), we get a palindrome (53133433135).

The spelling of 22121221013 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, thirteen".