122212351621 has 2 divisors, whose sum is σ = 122212351622. Its totient is φ = 122212351620.

The previous prime is 122212351537. The next prime is 122212351649. The reversal of 122212351621 is 126153212221.

It is a happy number.

It is an a-pointer prime, because the next prime (122212351649) can be obtained adding 122212351621 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114697368900 + 7514982721 = 338670^2 + 86689^2 .

It is a cyclic number.

It is not a de Polignac number, because 122212351621 - 2¹⁷ = 122212220549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122212351621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122212351691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61106175810 + 61106175811.

It is an arithmetic number, because the mean of its divisors is an integer number (61106175811).

Almost surely, 2^122212351621 is an apocalyptic number.

It is an amenable number.

122212351621 is a deficient number, since it is larger than the sum of its proper divisors (1).

122212351621 is an equidigital number, since it uses as much as digits as its factorization.

122212351621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

Adding to 122212351621 its reverse (126153212221), we get a palindrome (248365563842).

The spelling of 122212351621 in words is "one hundred twenty-two billion, two hundred twelve million, three hundred fifty-one thousand, six hundred twenty-one".