21225161473 has 4 divisors (see below), whose sum is σ = 21313969920. Its totient is φ = 21136353028.

The previous prime is 21225161467. The next prime is 21225161479. The reversal of 21225161473 is 37416152212.

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 an interprime number because it is at equal distance from previous prime (21225161467) and next prime (21225161479).

It is a cyclic number.

It is not a de Polignac number, because 21225161473 - 2⁹ = 21225160961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21225161479) 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, 44403865 + ... + 44404342.

It is an arithmetic number, because the mean of its divisors is an integer number (5328492480).

Almost surely, 2^21225161473 is an apocalyptic number.

It is an amenable number.

21225161473 is a deficient number, since it is larger than the sum of its proper divisors (88808447).

21225161473 is an equidigital number, since it uses as much as digits as its factorization.

21225161473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88808446.

The product of its digits is 20160, while the sum is 34.

The spelling of 21225161473 in words is "twenty-one billion, two hundred twenty-five million, one hundred sixty-one thousand, four hundred seventy-three".