21102028113 has 8 divisors (see below), whose sum is σ = 28136848608. Its totient is φ = 14067613184.

The previous prime is 21102028111. The next prime is 21102028127. The reversal of 21102028113 is 31182020112.

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 21102028113 - 2¹ = 21102028111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102028113.

It is not an unprimeable number, because it can be changed into a prime (21102028111) 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, 54070 + ... + 212432.

It is an arithmetic number, because the mean of its divisors is an integer number (3517106076).

Almost surely, 2^21102028113 is an apocalyptic number.

It is an amenable number.

21102028113 is a deficient number, since it is larger than the sum of its proper divisors (7034820495).

21102028113 is a wasteful number, since it uses less digits than its factorization.

21102028113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202783.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21102028113 its reverse (31182020112), we get a palindrome (52284048225).

The spelling of 21102028113 in words is "twenty-one billion, one hundred two million, twenty-eight thousand, one hundred thirteen".