21612033432601 has 4 divisors (see below), whose sum is σ = 21612077499600. Its totient is φ = 21611989365604.

The previous prime is 21612033432581. The next prime is 21612033432643. The reversal of 21612033432601 is 10623433021612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21612033432601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21612033832601) 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, 21289471 + ... + 22281508.

It is an arithmetic number, because the mean of its divisors is an integer number (5403019374900).

Almost surely, 2^{21612033432601} is an apocalyptic number.

It is an amenable number.

21612033432601 is a deficient number, since it is larger than the sum of its proper divisors (44066999).

21612033432601 is an equidigital number, since it uses as much as digits as its factorization.

21612033432601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44066998.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 21612033432601 in words is "twenty-one trillion, six hundred twelve billion, thirty-three million, four hundred thirty-two thousand, six hundred one".