21510002151 has 24 divisors (see below), whose sum is σ = 34036404480. Its totient is φ = 12981805200.

The previous prime is 21510002083. The next prime is 21510002197. The reversal of 21510002151 is 15120001512.

21510002151 is a `hidden beast` number, since 2 + 1 + 510 + 0 + 0 + 2 + 151 = 666.

It is not a de Polignac number, because 21510002151 - 2¹⁰ = 21510001127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510002551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 430885 + ... + 478206.

It is an arithmetic number, because the mean of its divisors is an integer number (1418183520).

Almost surely, 2^21510002151 is an apocalyptic number.

21510002151 is a deficient number, since it is larger than the sum of its proper divisors (12526402329).

21510002151 is a wasteful number, since it uses less digits than its factorization.

21510002151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909347 (or 909344 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 21510002151 its reverse (15120001512), we get a palindrome (36630003663).

The spelling of 21510002151 in words is "twenty-one billion, five hundred ten million, two thousand, one hundred fifty-one".