21216601261153 has 2 divisors, whose sum is σ = 21216601261154. Its totient is φ = 21216601261152.

The previous prime is 21216601261147. The next prime is 21216601261231. The reversal of 21216601261153 is 35116210661212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19770010537104 + 1446590724049 = 4446348^2 + 1202743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21216601261153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21216601261753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608300630576 + 10608300630577.

It is an arithmetic number, because the mean of its divisors is an integer number (10608300630577).

Almost surely, 2^{21216601261153} is an apocalyptic number.

It is an amenable number.

21216601261153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216601261153 is an equidigital number, since it uses as much as digits as its factorization.

21216601261153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 21216601261153 in words is "twenty-one trillion, two hundred sixteen billion, six hundred one million, two hundred sixty-one thousand, one hundred fifty-three".