21253641148 has 12 divisors (see below), whose sum is σ = 39151444360. Its totient is φ = 10067514192.

The previous prime is 21253641139. The next prime is 21253641169. The reversal of 21253641148 is 84114635212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139826511 + ... + 139826662.

Almost surely, 2^21253641148 is an apocalyptic number.

It is an amenable number.

21253641148 is a deficient number, since it is larger than the sum of its proper divisors (17897803212).

21253641148 is a wasteful number, since it uses less digits than its factorization.

21253641148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279653196 (or 279653194 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The spelling of 21253641148 in words is "twenty-one billion, two hundred fifty-three million, six hundred forty-one thousand, one hundred forty-eight".