21470625401 has 4 divisors (see below), whose sum is σ = 22050912612. Its totient is φ = 20890338192.

The previous prime is 21470625361. The next prime is 21470625403. The reversal of 21470625401 is 10452607412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17982541801 + 3488083600 = 134099^2 + 59060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470625401 is a prime.

It is a super-2 number, since 2×21470625401² (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 (21470625403) 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, 290143550 + ... + 290143623.

It is an arithmetic number, because the mean of its divisors is an integer number (5512728153).

Almost surely, 2^21470625401 is an apocalyptic number.

It is an amenable number.

21470625401 is a deficient number, since it is larger than the sum of its proper divisors (580287211).

21470625401 is an equidigital number, since it uses as much as digits as its factorization.

21470625401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580287210.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21470625401 in words is "twenty-one billion, four hundred seventy million, six hundred twenty-five thousand, four hundred one".