21401408101 has 4 divisors (see below), whose sum is σ = 21401771104. Its totient is φ = 21401045100.

The previous prime is 21401408071. The next prime is 21401408107. The reversal of 21401408101 is 10180410412.

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 a de Polignac number, because none of the positive numbers 2^k-21401408101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401408107) 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, 70395 + ... + 218536.

It is an arithmetic number, because the mean of its divisors is an integer number (5350442776).

Almost surely, 2^21401408101 is an apocalyptic number.

It is an amenable number.

21401408101 is a deficient number, since it is larger than the sum of its proper divisors (363003).

21401408101 is an equidigital number, since it uses as much as digits as its factorization.

21401408101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363002.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 21401408101 its reverse (10180410412), we get a palindrome (31581818513).

The spelling of 21401408101 in words is "twenty-one billion, four hundred one million, four hundred eight thousand, one hundred one".