21120202231313 has 16 divisors (see below), whose sum is σ = 22161019136256. Its totient is φ = 20089605539520.

The previous prime is 21120202231309. The next prime is 21120202231321. The reversal of 21120202231313 is 31313220202112.

It is a cyclic number.

It is not a de Polignac number, because 21120202231313 - 2² = 21120202231309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120202231333) 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, 145120220 + ... + 145265682.

It is an arithmetic number, because the mean of its divisors is an integer number (1385063696016).

Almost surely, 2^{21120202231313} is an apocalyptic number.

21120202231313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21120202231313 is a deficient number, since it is larger than the sum of its proper divisors (1040816904943).

21120202231313 is a wasteful number, since it uses less digits than its factorization.

21120202231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180544.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21120202231313 its reverse (31313220202112), we get a palindrome (52433422433425).

The spelling of 21120202231313 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, two hundred thirty-one thousand, three hundred thirteen".