21226336664153 has 2 divisors, whose sum is σ = 21226336664154. Its totient is φ = 21226336664152.

The previous prime is 21226336664107. The next prime is 21226336664243. The reversal of 21226336664153 is 35146663362212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18927998799424 + 2298337864729 = 4350632^2 + 1516027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226336664153 - 2⁶ = 21226336664089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21226336664353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613168332076 + 10613168332077.

It is an arithmetic number, because the mean of its divisors is an integer number (10613168332077).

Almost surely, 2^{21226336664153} is an apocalyptic number.

It is an amenable number.

21226336664153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226336664153 is an equidigital number, since it uses as much as digits as its factorization.

21226336664153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 50.

The spelling of 21226336664153 in words is "twenty-one trillion, two hundred twenty-six billion, three hundred thirty-six million, six hundred sixty-four thousand, one hundred fifty-three".