21123516641001 has 8 divisors (see below), whose sum is σ = 28229734327200. Its totient is φ = 14049821691072.

The previous prime is 21123516640969. The next prime is 21123516641053. The reversal of 21123516641001 is 10014661532112.

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

It is not a de Polignac number, because 21123516641001 - 2⁵ = 21123516640969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123516642001) 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, 8130682551 + ... + 8130685148.

It is an arithmetic number, because the mean of its divisors is an integer number (3528716790900).

Almost surely, 2^{21123516641001} is an apocalyptic number.

It is an amenable number.

21123516641001 is a deficient number, since it is larger than the sum of its proper divisors (7106217686199).

21123516641001 is a wasteful number, since it uses less digits than its factorization.

21123516641001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16261368135.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 21123516641001 in words is "twenty-one trillion, one hundred twenty-three billion, five hundred sixteen million, six hundred forty-one thousand, one".