21415113355 has 8 divisors (see below), whose sum is σ = 26815446432. Its totient is φ = 16387217088.

The previous prime is 21415113353. The next prime is 21415113361. The reversal of 21415113355 is 55331151412.

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 21415113355 - 2¹ = 21415113353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415113353) 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, 93109074 + ... + 93109303.

It is an arithmetic number, because the mean of its divisors is an integer number (3351930804).

Almost surely, 2^21415113355 is an apocalyptic number.

21415113355 is a deficient number, since it is larger than the sum of its proper divisors (5400333077).

21415113355 is a wasteful number, since it uses less digits than its factorization.

21415113355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186218405.

The product of its digits is 9000, while the sum is 31.

Adding to 21415113355 its reverse (55331151412), we get a palindrome (76746264767).

The spelling of 21415113355 in words is "twenty-one billion, four hundred fifteen million, one hundred thirteen thousand, three hundred fifty-five".