21515520534414 has 16 divisors (see below), whose sum is σ = 43425821263440. Its totient is φ = 7106043479040.

The previous prime is 21515520534413. The next prime is 21515520534451. The reversal of 21515520534414 is 41443502551512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515520534413) 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, 16449174067 + ... + 16449175374.

It is an arithmetic number, because the mean of its divisors is an integer number (2714113828965).

Almost surely, 2^{21515520534414} is an apocalyptic number.

21515520534414 is an abundant number, since it is smaller than the sum of its proper divisors (21910300729026).

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

21515520534414 is a wasteful number, since it uses less digits than its factorization.

21515520534414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32898349555.

The product of its (nonzero) digits is 480000, while the sum is 42.

The spelling of 21515520534414 in words is "twenty-one trillion, five hundred fifteen billion, five hundred twenty million, five hundred thirty-four thousand, four hundred fourteen".