21213225153 has 6 divisors (see below), whose sum is σ = 30641325234. Its totient is φ = 14142150096.

The previous prime is 21213225119. The next prime is 21213225169. The reversal of 21213225153 is 35152231212.

21213225153 is a `hidden beast` number, since 2 + 12 + 132 + 2 + 515 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21034281024 + 178944129 = 145032^2 + 13377^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21213225153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213225193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178512500 + ... + 1178512517.

It is an arithmetic number, because the mean of its divisors is an integer number (5106887539).

Almost surely, 2^21213225153 is an apocalyptic number.

It is an amenable number.

21213225153 is a deficient number, since it is larger than the sum of its proper divisors (9428100081).

21213225153 is a wasteful number, since it uses less digits than its factorization.

21213225153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357025023 (or 2357025020 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

Adding to 21213225153 its reverse (35152231212), we get a palindrome (56365456365).

The spelling of 21213225153 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty-five thousand, one hundred fifty-three".