21155002513416 has 48 divisors (see below), whose sum is σ = 59416828052400. Its totient is φ = 7051667503824.

The previous prime is 21155002513373. The next prime is 21155002513441. The reversal of 21155002513416 is 61431520055112.

21155002513416 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 500 + 2 + 5 + 134 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5441099526 + ... + 5441103413.

It is an arithmetic number, because the mean of its divisors is an integer number (1237850584425).

Almost surely, 2^{21155002513416} is an apocalyptic number.

It is an amenable number.

21155002513416 is an abundant number, since it is smaller than the sum of its proper divisors (38261825538984).

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

21155002513416 is a wasteful number, since it uses less digits than its factorization.

21155002513416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10882202960 (or 10882202944 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 21155002513416 its reverse (61431520055112), we get a palindrome (82586522568528).

The spelling of 21155002513416 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred thirteen thousand, four hundred sixteen".