21223645153 has 2 divisors, whose sum is σ = 21223645154. Its totient is φ = 21223645152.

The previous prime is 21223645097. The next prime is 21223645159. The reversal of 21223645153 is 35154632212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20745217024 + 478428129 = 144032^2 + 21873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223645153 is a prime.

It is a super-2 number, since 2×21223645153² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21223645159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611822576 + 10611822577.

It is an arithmetic number, because the mean of its divisors is an integer number (10611822577).

Almost surely, 2^21223645153 is an apocalyptic number.

It is an amenable number.

21223645153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223645153 is an equidigital number, since it uses as much as digits as its factorization.

21223645153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 34.

The spelling of 21223645153 in words is "twenty-one billion, two hundred twenty-three million, six hundred forty-five thousand, one hundred fifty-three".