21402341501 has 4 divisors (see below), whose sum is σ = 22332878112. Its totient is φ = 20471804892.

The previous prime is 21402341497. The next prime is 21402341507. The reversal of 21402341501 is 10514320412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21402341501 - 2² = 21402341497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 930536587 = 21402341501 / (2 + 1 + 4 + 0 + 2 + 3 + 4 + 1 + 5 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402341507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465268271 + ... + 465268316.

It is an arithmetic number, because the mean of its divisors is an integer number (5583219528).

Almost surely, 2^21402341501 is an apocalyptic number.

It is an amenable number.

21402341501 is a deficient number, since it is larger than the sum of its proper divisors (930536611).

21402341501 is an equidigital number, since it uses as much as digits as its factorization.

21402341501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930536610.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21402341501 its reverse (10514320412), we get a palindrome (31916661913).

The spelling of 21402341501 in words is "twenty-one billion, four hundred two million, three hundred forty-one thousand, five hundred one".