21255114424 has 32 divisors (see below), whose sum is σ = 41159221200. Its totient is φ = 10282533120.

The previous prime is 21255114383. The next prime is 21255114431. The reversal of 21255114424 is 42441155212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147597 + ... + 253564.

Almost surely, 2^21255114424 is an apocalyptic number.

It is an amenable number.

21255114424 is a deficient number, since it is larger than the sum of its proper divisors (19904106776).

21255114424 is a wasteful number, since it uses less digits than its factorization.

21255114424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401383 (or 401379 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

Adding to 21255114424 its reverse (42441155212), we get a palindrome (63696269636).

The spelling of 21255114424 in words is "twenty-one billion, two hundred fifty-five million, one hundred fourteen thousand, four hundred twenty-four".