21423031201 has 16 divisors (see below), whose sum is σ = 25197032448. Its totient is φ = 17956857600.

The previous prime is 21423031141. The next prime is 21423031207. The reversal of 21423031201 is 10213032412.

It is a happy number.

It is not a de Polignac number, because 21423031201 - 2¹⁵ = 21422998433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423031207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40960 + ... + 211006.

It is an arithmetic number, because the mean of its divisors is an integer number (1574814528).

Almost surely, 2^21423031201 is an apocalyptic number.

It is an amenable number.

21423031201 is a deficient number, since it is larger than the sum of its proper divisors (3774001247).

21423031201 is a wasteful number, since it uses less digits than its factorization.

21423031201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170952.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21423031201 its reverse (10213032412), we get a palindrome (31636063613).

The spelling of 21423031201 in words is "twenty-one billion, four hundred twenty-three million, thirty-one thousand, two hundred one".