21445521545111 has 8 divisors (see below), whose sum is σ = 22596517759920. Its totient is φ = 20296753785792.

The previous prime is 21445521544919. The next prime is 21445521545167. The reversal of 21445521545111 is 11154512554412.

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

It is a cyclic number.

It is not a de Polignac number, because 21445521545111 - 2¹⁰ = 21445521544087 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 (21445521545411) 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, 557094110 + ... + 557132603.

It is an arithmetic number, because the mean of its divisors is an integer number (2824564719990).

Almost surely, 2^{21445521545111} is an apocalyptic number.

21445521545111 is a deficient number, since it is larger than the sum of its proper divisors (1150996214809).

21445521545111 is a wasteful number, since it uses less digits than its factorization.

21445521545111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114227745.

The product of its digits is 160000, while the sum is 41.

The spelling of 21445521545111 in words is "twenty-one trillion, four hundred forty-five billion, five hundred twenty-one million, five hundred forty-five thousand, one hundred eleven".