21615566101052 has 48 divisors (see below), whose sum is σ = 47181330970368. Its totient is φ = 8418060587520.

The previous prime is 21615566100991. The next prime is 21615566101069. The reversal of 21615566101052 is 25010166551612.

It is a super-3 number, since 3×21615566101052³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent 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, 14228213 + ... + 15673964.

It is an arithmetic number, because the mean of its divisors is an integer number (982944395216).

Almost surely, 2^{21615566101052} is an apocalyptic number.

21615566101052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21615566101052 is an abundant number, since it is smaller than the sum of its proper divisors (25565764869316).

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

21615566101052 is a wasteful number, since it uses less digits than its factorization.

21615566101052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29904546 (or 29904544 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 21615566101052 in words is "twenty-one trillion, six hundred fifteen billion, five hundred sixty-six million, one hundred one thousand, fifty-two".