21315104500355 has 16 divisors (see below), whose sum is σ = 26661507088800. Its totient is φ = 16343586369792.

The previous prime is 21315104500331. The next prime is 21315104500363. The reversal of 21315104500355 is 55300540151312.

It is a cyclic number.

It is not a de Polignac number, because 21315104500355 - 2¹⁴ = 21315104483971 is a prime.

It is a super-2 number, since 2×21315104500355² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859814330 + ... + 859839119.

It is an arithmetic number, because the mean of its divisors is an integer number (1666344193050).

Almost surely, 2^{21315104500355} is an apocalyptic number.

21315104500355 is a deficient number, since it is larger than the sum of its proper divisors (5346402588445).

21315104500355 is a wasteful number, since it uses less digits than its factorization.

21315104500355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719653558.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 21315104500355 its reverse (55300540151312), we get a palindrome (76615644651667).

The spelling of 21315104500355 in words is "twenty-one trillion, three hundred fifteen billion, one hundred four million, five hundred thousand, three hundred fifty-five".