21011852455 has 8 divisors (see below), whose sum is σ = 27506425104. Its totient is φ = 15281347200.

The previous prime is 21011852431. The next prime is 21011852479. The reversal of 21011852455 is 55425811012.

It is an interprime number because it is at equal distance from previous prime (21011852431) and next prime (21011852479).

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

It is not a de Polignac number, because 21011852455 - 2⁷ = 21011852327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011852455.

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 7 ways as a sum of consecutive naturals, for example, 191016786 + ... + 191016895.

It is an arithmetic number, because the mean of its divisors is an integer number (3438303138).

Almost surely, 2^21011852455 is an apocalyptic number.

21011852455 is a deficient number, since it is larger than the sum of its proper divisors (6494572649).

21011852455 is a wasteful number, since it uses less digits than its factorization.

21011852455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382033697.

The product of its (nonzero) digits is 16000, while the sum is 34.

The spelling of 21011852455 in words is "twenty-one billion, eleven million, eight hundred fifty-two thousand, four hundred fifty-five".