21021012222701 has 2 divisors, whose sum is σ = 21021012222702. Its totient is φ = 21021012222700.

The previous prime is 21021012222659. The next prime is 21021012222709. The reversal of 21021012222701 is 10722221012012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19765937892100 + 1255074330601 = 4445890^2 + 1120301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021012222701 - 2²⁶ = 21020945113837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021012222709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510506111350 + 10510506111351.

It is an arithmetic number, because the mean of its divisors is an integer number (10510506111351).

Almost surely, 2^{21021012222701} is an apocalyptic number.

It is an amenable number.

21021012222701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021012222701 is an equidigital number, since it uses as much as digits as its factorization.

21021012222701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21021012222701 its reverse (10722221012012), we get a palindrome (31743233234713).

The spelling of 21021012222701 in words is "twenty-one trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, seven hundred one".