21113136355 has 8 divisors (see below), whose sum is σ = 25432098912. Its totient is φ = 16826285568.

The previous prime is 21113136347. The next prime is 21113136361. The reversal of 21113136355 is 55363131112.

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 21113136355 - 2³ = 21113136347 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8026494 + ... + 8029123.

It is an arithmetic number, because the mean of its divisors is an integer number (3179012364).

Almost surely, 2^21113136355 is an apocalyptic number.

21113136355 is a deficient number, since it is larger than the sum of its proper divisors (4318962557).

21113136355 is a wasteful number, since it uses less digits than its factorization.

21113136355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16055885.

The product of its digits is 8100, while the sum is 31.

Adding to 21113136355 its reverse (55363131112), we get a palindrome (76476267467).

The spelling of 21113136355 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-six thousand, three hundred fifty-five".