21113020355 has 8 divisors (see below), whose sum is σ = 28954999392. Its totient is φ = 14477499648.

The previous prime is 21113020351. The next prime is 21113020367. The reversal of 21113020355 is 55302031112.

It is a happy number.

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 21113020355 - 2² = 21113020351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113020355.

It is not an unprimeable number, because it can be changed into a prime (21113020351) 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, 301614542 + ... + 301614611.

It is an arithmetic number, because the mean of its divisors is an integer number (3619374924).

Almost surely, 2^21113020355 is an apocalyptic number.

21113020355 is a deficient number, since it is larger than the sum of its proper divisors (7841979037).

21113020355 is an equidigital number, since it uses as much as digits as its factorization.

21113020355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603229165.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21113020355 its reverse (55302031112), we get a palindrome (76415051467).

The spelling of 21113020355 in words is "twenty-one billion, one hundred thirteen million, twenty thousand, three hundred fifty-five".