21222010120621 has 2 divisors, whose sum is σ = 21222010120622. Its totient is φ = 21222010120620.

The previous prime is 21222010120607. The next prime is 21222010120631. The reversal of 21222010120621 is 12602101022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11747550600900 + 9474459519721 = 3427470^2 + 3078061^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222010120621 - 2²⁹ = 21221473249709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222010120592 and 21222010120601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222010120631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611005060310 + 10611005060311.

It is an arithmetic number, because the mean of its divisors is an integer number (10611005060311).

Almost surely, 2^{21222010120621} is an apocalyptic number.

It is an amenable number.

21222010120621 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222010120621 is an equidigital number, since it uses as much as digits as its factorization.

21222010120621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21222010120621 its reverse (12602101022212), we get a palindrome (33824111142833).

The spelling of 21222010120621 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, one hundred twenty thousand, six hundred twenty-one".