21031020113 has 8 divisors (see below), whose sum is σ = 22101739968. Its totient is φ = 19986737904.

The previous prime is 21031020107. The next prime is 21031020119. The reversal of 21031020113 is 31102013012.

It is an interprime number because it is at equal distance from previous prime (21031020107) and next prime (21031020119).

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 21031020113 - 2⁴ = 21031020097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031020119) 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, 6607781 + ... + 6610962.

It is an arithmetic number, because the mean of its divisors is an integer number (2762717496).

Almost surely, 2^21031020113 is an apocalyptic number.

It is an amenable number.

21031020113 is a deficient number, since it is larger than the sum of its proper divisors (1070719855).

21031020113 is a wasteful number, since it uses less digits than its factorization.

21031020113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13218823.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031020113 its reverse (31102013012), we get a palindrome (52133033125).

The spelling of 21031020113 in words is "twenty-one billion, thirty-one million, twenty thousand, one hundred thirteen".