21220211122153 has 2 divisors, whose sum is σ = 21220211122154. Its totient is φ = 21220211122152.

The previous prime is 21220211122133. The next prime is 21220211122211. The reversal of 21220211122153 is 35122111202212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14069678415849 + 7150532706304 = 3750957^2 + 2674048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220211122153 - 2³⁷ = 21082772168681 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220211122133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610105561076 + 10610105561077.

It is an arithmetic number, because the mean of its divisors is an integer number (10610105561077).

Almost surely, 2^{21220211122153} is an apocalyptic number.

It is an amenable number.

21220211122153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220211122153 is an equidigital number, since it uses as much as digits as its factorization.

21220211122153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21220211122153 its reverse (35122111202212), we get a palindrome (56342322324365).

The spelling of 21220211122153 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-two thousand, one hundred fifty-three".