21150232502111 has 4 divisors (see below), whose sum is σ = 21150276824952. Its totient is φ = 21150188179272.

The previous prime is 21150232502083. The next prime is 21150232502123. The reversal of 21150232502111 is 11120523205112.

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-21150232502111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150232502911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21437765 + ... + 22402638.

It is an arithmetic number, because the mean of its divisors is an integer number (5287569206238).

Almost surely, 2^{21150232502111} is an apocalyptic number.

21150232502111 is a deficient number, since it is larger than the sum of its proper divisors (44322841).

21150232502111 is an equidigital number, since it uses as much as digits as its factorization.

21150232502111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44322840.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21150232502111 its reverse (11120523205112), we get a palindrome (32270755707223).

The spelling of 21150232502111 in words is "twenty-one trillion, one hundred fifty billion, two hundred thirty-two million, five hundred two thousand, one hundred eleven".