21312230401 has 8 divisors (see below), whose sum is σ = 26571092544. Its totient is φ = 16606932720.

The previous prime is 21312230351. The next prime is 21312230411. The reversal of 21312230401 is 10403221312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21312230401 - 2⁹ = 21312229889 is a prime.

It is a super-2 number, since 2×21312230401² (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 (21312230411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138391030 + ... + 138391183.

It is an arithmetic number, because the mean of its divisors is an integer number (3321386568).

Almost surely, 2^21312230401 is an apocalyptic number.

It is an amenable number.

21312230401 is a deficient number, since it is larger than the sum of its proper divisors (5258862143).

21312230401 is a wasteful number, since it uses less digits than its factorization.

21312230401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276782231.

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

Adding to 21312230401 its reverse (10403221312), we get a palindrome (31715451713).

The spelling of 21312230401 in words is "twenty-one billion, three hundred twelve million, two hundred thirty thousand, four hundred one".