21515420535114 has 32 divisors (see below), whose sum is σ = 47508310854144. Its totient is φ = 6441272301680.

The previous prime is 21515420535107. The next prime is 21515420535131. The reversal of 21515420535114 is 41153502451512.

It is a Curzon number.

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, 1963797054 + ... + 1963808009.

It is an arithmetic number, because the mean of its divisors is an integer number (1484634714192).

Almost surely, 2^{21515420535114} is an apocalyptic number.

21515420535114 is an abundant number, since it is smaller than the sum of its proper divisors (25992890319030).

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

21515420535114 is a wasteful number, since it uses less digits than its factorization.

21515420535114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927605162.

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 21515420535114 its reverse (41153502451512), we get a palindrome (62668922986626).

The spelling of 21515420535114 in words is "twenty-one trillion, five hundred fifteen billion, four hundred twenty million, five hundred thirty-five thousand, one hundred fourteen".