21110001210504 has 96 divisors (see below), whose sum is σ = 59031430698240. Its totient is φ = 6808036694400.

The previous prime is 21110001210469. The next prime is 21110001210541. The reversal of 21110001210504 is 40501210001112.

It is a super-2 number, since 2×21110001210504² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8140839 + ... + 10416009.

It is an arithmetic number, because the mean of its divisors is an integer number (614910736440).

Almost surely, 2^{21110001210504} is an apocalyptic number.

21110001210504 is a gapful number since it is divisible by the number (24) 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 21110001210504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29515715349120).

21110001210504 is an abundant number, since it is smaller than the sum of its proper divisors (37921429487736).

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

21110001210504 is a wasteful number, since it uses less digits than its factorization.

21110001210504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279371 (or 2279364 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 21110001210504 its reverse (40501210001112), we get a palindrome (61611211211616).

The spelling of 21110001210504 in words is "twenty-one trillion, one hundred ten billion, one million, two hundred ten thousand, five hundred four".