21503116151 has 8 divisors (see below), whose sum is σ = 23483206800. Its totient is φ = 19527235840.

The previous prime is 21503116147. The next prime is 21503116163. The reversal of 21503116151 is 15161130512.

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 21503116151 - 2² = 21503116147 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 21503116151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503116121) 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, 1041896 + ... + 1062333.

It is an arithmetic number, because the mean of its divisors is an integer number (2935400850).

Almost surely, 2^21503116151 is an apocalyptic number.

21503116151 is a deficient number, since it is larger than the sum of its proper divisors (1980090649).

21503116151 is a wasteful number, since it uses less digits than its factorization.

21503116151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105169.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 21503116151 its reverse (15161130512), we get a palindrome (36664246663).

The spelling of 21503116151 in words is "twenty-one billion, five hundred three million, one hundred sixteen thousand, one hundred fifty-one".