21242525551 has 8 divisors (see below), whose sum is σ = 22911608160. Its totient is φ = 19578448992.

The previous prime is 21242525543. The next prime is 21242525561. The reversal of 21242525551 is 15552524212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21242525551 - 2³ = 21242525543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242525561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242691 + ... + 1259668.

It is an arithmetic number, because the mean of its divisors is an integer number (2863951020).

Almost surely, 2^21242525551 is an apocalyptic number.

21242525551 is a deficient number, since it is larger than the sum of its proper divisors (1669082609).

21242525551 is a wasteful number, since it uses less digits than its factorization.

21242525551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503025.

The product of its digits is 40000, while the sum is 34.

The spelling of 21242525551 in words is "twenty-one billion, two hundred forty-two million, five hundred twenty-five thousand, five hundred fifty-one".