21555264652001 has 8 divisors (see below), whose sum is σ = 21839590907904. Its totient is φ = 21272328745200.

The previous prime is 21555264651901. The next prime is 21555264652027. The reversal of 21555264652001 is 10025646255512.

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 21555264652001 - 2¹⁴ = 21555264635617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21555264612001) 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, 347556065 + ... + 347618078.

It is an arithmetic number, because the mean of its divisors is an integer number (2729948863488).

Almost surely, 2^{21555264652001} is an apocalyptic number.

It is an amenable number.

21555264652001 is a deficient number, since it is larger than the sum of its proper divisors (284326255903).

21555264652001 is a wasteful number, since it uses less digits than its factorization.

21555264652001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695174551.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 21555264652001 in words is "twenty-one trillion, five hundred fifty-five billion, two hundred sixty-four million, six hundred fifty-two thousand, one".