21202123313 has 16 divisors (see below), whose sum is σ = 25758867840. Its totient is φ = 17046288000.

The previous prime is 21202123309. The next prime is 21202123333. The reversal of 21202123313 is 31332120212.

It is not a de Polignac number, because 21202123313 - 2² = 21202123309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202123303) 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, 775748 + ... + 802613.

It is an arithmetic number, because the mean of its divisors is an integer number (1609929240).

Almost surely, 2^21202123313 is an apocalyptic number.

It is an amenable number.

21202123313 is a deficient number, since it is larger than the sum of its proper divisors (4556744527).

21202123313 is a wasteful number, since it uses less digits than its factorization.

21202123313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578488.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21202123313 its reverse (31332120212), we get a palindrome (52534243525).

The spelling of 21202123313 in words is "twenty-one billion, two hundred two million, one hundred twenty-three thousand, three hundred thirteen".