21351510401 has 8 divisors (see below), whose sum is σ = 22996599360. Its totient is φ = 19706802192.

The previous prime is 21351510377. The next prime is 21351510403. The reversal of 21351510401 is 10401515312.

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 21351510401 - 2⁶ = 21351510337 is a prime.

It is a super-2 number, since 2×21351510401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21351510403) 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, 27116 + ... + 208418.

It is an arithmetic number, because the mean of its divisors is an integer number (2874574920).

Almost surely, 2^21351510401 is an apocalyptic number.

It is an amenable number.

21351510401 is a deficient number, since it is larger than the sum of its proper divisors (1645088959).

21351510401 is a wasteful number, since it uses less digits than its factorization.

21351510401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190375.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 21351510401 in words is "twenty-one billion, three hundred fifty-one million, five hundred ten thousand, four hundred one".