21154645610601 has 8 divisors (see below), whose sum is σ = 28206289451424. Its totient is φ = 14103049421760.

The previous prime is 21154645610599. The next prime is 21154645610617. The reversal of 21154645610601 is 10601654645112.

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

It is not a de Polignac number, because 21154645610601 - 2¹ = 21154645610599 is a prime.

It is a super-2 number, since 2×21154645610601² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21154645610101) 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, 10863936 + ... + 12662321.

It is an arithmetic number, because the mean of its divisors is an integer number (3525786181428).

Almost surely, 2^{21154645610601} is an apocalyptic number.

It is an amenable number.

21154645610601 is a deficient number, since it is larger than the sum of its proper divisors (7051643840823).

21154645610601 is a wasteful number, since it uses less digits than its factorization.

21154645610601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23825991.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21154645610601 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred forty-five million, six hundred ten thousand, six hundred one".