21245752151 has 4 divisors (see below), whose sum is σ = 22880040792. Its totient is φ = 19611463512.

The previous prime is 21245752141. The next prime is 21245752153. The reversal of 21245752151 is 15125754212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21245752151 is a prime.

It is a super-2 number, since 2×21245752151² (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 (21245752153) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 817144301 + ... + 817144326.

It is an arithmetic number, because the mean of its divisors is an integer number (5720010198).

Almost surely, 2^21245752151 is an apocalyptic number.

21245752151 is a deficient number, since it is larger than the sum of its proper divisors (1634288641).

21245752151 is a wasteful number, since it uses less digits than its factorization.

21245752151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634288640.

The product of its digits is 28000, while the sum is 35.

The spelling of 21245752151 in words is "twenty-one billion, two hundred forty-five million, seven hundred fifty-two thousand, one hundred fifty-one".