21555245262 has 8 divisors (see below), whose sum is σ = 43110490536. Its totient is φ = 7185081752.

The previous prime is 21555245237. The next prime is 21555245287. The reversal of 21555245262 is 26254255512.

It is an interprime number because it is at equal distance from previous prime (21555245237) and next prime (21555245287).

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

21555245262 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21555245262.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796270433 + ... + 1796270444.

It is an arithmetic number, because the mean of its divisors is an integer number (5388811317).

Almost surely, 2^21555245262 is an apocalyptic number.

21555245262 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21555245262 is a wasteful number, since it uses less digits than its factorization.

21555245262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592540882.

The product of its digits is 240000, while the sum is 39.

The spelling of 21555245262 in words is "twenty-one billion, five hundred fifty-five million, two hundred forty-five thousand, two hundred sixty-two".