21515453415330 has 64 divisors (see below), whose sum is σ = 59021688960000. Its totient is φ = 4917161767104.

The previous prime is 21515453415301. The next prime is 21515453415353. The reversal of 21515453415330 is 3351435451512.

It is a super-2 number, since 2×21515453415330² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5256424 + ... + 8406003.

It is an arithmetic number, because the mean of its divisors is an integer number (922213890000).

Almost surely, 2^{21515453415330} is an apocalyptic number.

21515453415330 is an abundant number, since it is smaller than the sum of its proper divisors (37506235544670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21515453415330 is a wasteful number, since it uses less digits than its factorization.

21515453415330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13669943.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 21515453415330 its reverse (3351435451512), we get a palindrome (24866888866842).

The spelling of 21515453415330 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-three million, four hundred fifteen thousand, three hundred thirty".