21110410020 has 192 divisors, whose sum is σ = 69869076480. Its totient is φ = 4662448128.

The previous prime is 21110410003. The next prime is 21110410031. The reversal of 21110410020 is 2001401112.

It is a happy number.

It is a super-2 number, since 2×21110410020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21110409978 and 21110410005.

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, 1552692 + ... + 1566228.

It is an arithmetic number, because the mean of its divisors is an integer number (363901440).

Almost surely, 2^21110410020 is an apocalyptic number.

21110410020 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 21110410020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34934538240).

21110410020 is an abundant number, since it is smaller than the sum of its proper divisors (48758666460).

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

21110410020 is a wasteful number, since it uses less digits than its factorization.

21110410020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13682 (or 13680 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110410020 its reverse (2001401112), we get a palindrome (23111811132).

The spelling of 21110410020 in words is "twenty-one billion, one hundred ten million, four hundred ten thousand, twenty".