21612520144111 has 8 divisors (see below), whose sum is σ = 23275886445504. Its totient is φ = 19949277378720.

The previous prime is 21612520144087. The next prime is 21612520144129. The reversal of 21612520144111 is 11144102521612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21612520144111 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 (21612520114111) 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, 30520480 + ... + 31220581.

It is an arithmetic number, because the mean of its divisors is an integer number (2909485805688).

Almost surely, 2^{21612520144111} is an apocalyptic number.

21612520144111 is a deficient number, since it is larger than the sum of its proper divisors (1663366301393).

21612520144111 is a wasteful number, since it uses less digits than its factorization.

21612520144111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61768001.

The product of its (nonzero) digits is 3840, while the sum is 31.

Adding to 21612520144111 its reverse (11144102521612), we get a palindrome (32756622665723).

The spelling of 21612520144111 in words is "twenty-one trillion, six hundred twelve billion, five hundred twenty million, one hundred forty-four thousand, one hundred eleven".