21401212313 has 8 divisors (see below), whose sum is σ = 23069445000. Its totient is φ = 19736120448.

The previous prime is 21401212309. The next prime is 21401212319. The reversal of 21401212313 is 31321210412.

It can be written as a sum of positive squares in 4 ways, for example, as 4742663689 + 16658548624 = 68867^2 + 129068^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21401212313 - 2² = 21401212309 is a prime.

It is a super-2 number, since 2×21401212313² (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 (21401212319) 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, 771038 + ... + 798311.

It is an arithmetic number, because the mean of its divisors is an integer number (2883680625).

Almost surely, 2^21401212313 is an apocalyptic number.

It is an amenable number.

21401212313 is a deficient number, since it is larger than the sum of its proper divisors (1668232687).

21401212313 is a wasteful number, since it uses less digits than its factorization.

21401212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570411.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21401212313 its reverse (31321210412), we get a palindrome (52722422725).

The spelling of 21401212313 in words is "twenty-one billion, four hundred one million, two hundred twelve thousand, three hundred thirteen".