21512303111 has 8 divisors (see below), whose sum is σ = 23379639360. Its totient is φ = 19675330272.

The previous prime is 21512303039. The next prime is 21512303147. The reversal of 21512303111 is 11130321512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21512303111 - 2¹⁰ = 21512302087 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 (21512303411) 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, 7589375 + ... + 7592208.

It is an arithmetic number, because the mean of its divisors is an integer number (2922454920).

Almost surely, 2^21512303111 is an apocalyptic number.

21512303111 is a deficient number, since it is larger than the sum of its proper divisors (1867336249).

21512303111 is a wasteful number, since it uses less digits than its factorization.

21512303111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15181705.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 21512303111 its reverse (11130321512), we get a palindrome (32642624623).

The spelling of 21512303111 in words is "twenty-one billion, five hundred twelve million, three hundred three thousand, one hundred eleven".