21120660542611 has 8 divisors (see below), whose sum is σ = 25408313434880. Its totient is φ = 17150611568328.

The previous prime is 21120660542599. The next prime is 21120660542623. The reversal of 21120660542611 is 11624506602112.

It is an interprime number because it is at equal distance from previous prime (21120660542599) and next prime (21120660542623).

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

It is not a de Polignac number, because 21120660542611 - 2⁷ = 21120660542483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120660542911) 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, 79400979351 + ... + 79400979616.

It is an arithmetic number, because the mean of its divisors is an integer number (3176039179360).

Almost surely, 2^{21120660542611} is an apocalyptic number.

21120660542611 is a deficient number, since it is larger than the sum of its proper divisors (4287652892269).

21120660542611 is a wasteful number, since it uses less digits than its factorization.

21120660542611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158801958993.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21120660542611 in words is "twenty-one trillion, one hundred twenty billion, six hundred sixty million, five hundred forty-two thousand, six hundred eleven".