21045256151 has 8 divisors (see below), whose sum is σ = 21962285664. Its totient is φ = 20128394880.

The previous prime is 21045256147. The next prime is 21045256187. The reversal of 21045256151 is 15165254012.

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 21045256151 - 2² = 21045256147 is a prime.

It is a super-2 number, since 2×21045256151² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045255151) 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, 259715 + ... + 330971.

It is an arithmetic number, because the mean of its divisors is an integer number (2745285708).

Almost surely, 2^21045256151 is an apocalyptic number.

21045256151 is a deficient number, since it is larger than the sum of its proper divisors (917029513).

21045256151 is a wasteful number, since it uses less digits than its factorization.

21045256151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84121.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 21045256151 in words is "twenty-one billion, forty-five million, two hundred fifty-six thousand, one hundred fifty-one".