21121020313 has 8 divisors (see below), whose sum is σ = 22257539136. Its totient is φ = 20002686000.

The previous prime is 21121020311. The next prime is 21121020341. The reversal of 21121020313 is 31302012112.

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

It is not a de Polignac number, because 21121020313 - 2¹ = 21121020311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121020311) 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, 4543743 + ... + 4548388.

It is an arithmetic number, because the mean of its divisors is an integer number (2782192392).

Almost surely, 2^21121020313 is an apocalyptic number.

21121020313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21121020313 is a deficient number, since it is larger than the sum of its proper divisors (1136518823).

21121020313 is a wasteful number, since it uses less digits than its factorization.

21121020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092255.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21121020313 its reverse (31302012112), we get a palindrome (52423032425).

The spelling of 21121020313 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, three hundred thirteen".