21616051003500 has 192 divisors, whose sum is σ = 65792437401600. Its totient is φ = 5504449350400.

The previous prime is 21616051003489. The next prime is 21616051003511. The reversal of 21616051003500 is 530015061612.

It is an interprime number because it is at equal distance from previous prime (21616051003489) and next prime (21616051003511).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20142502 + ... + 21188498.

It is an arithmetic number, because the mean of its divisors is an integer number (342668944800).

Almost surely, 2^{21616051003500} is an apocalyptic number.

21616051003500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21616051003500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32896218700800).

21616051003500 is an abundant number, since it is smaller than the sum of its proper divisors (44176386398100).

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

21616051003500 is a wasteful number, since it uses less digits than its factorization.

21616051003500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046641 (or 1046629 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 21616051003500 in words is "twenty-one trillion, six hundred sixteen billion, fifty-one million, three thousand, five hundred".