21110230020 has 192 divisors, whose sum is σ = 65637734400. Its totient is φ = 5026391040.

The previous prime is 21110230007. The next prime is 21110230027. The reversal of 21110230020 is 2003201112.

It is a super-2 number, since 2×21110230020² (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 = 21110229978 and 21110230005.

It is not an unprimeable number, because it can be changed into a prime (21110230027) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25160761 + ... + 25161599.

It is an arithmetic number, because the mean of its divisors is an integer number (341863200).

Almost surely, 2^21110230020 is an apocalyptic number.

21110230020 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 21110230020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32818867200).

21110230020 is an abundant number, since it is smaller than the sum of its proper divisors (44527504380).

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

21110230020 is a wasteful number, since it uses less digits than its factorization.

21110230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21110230020 its reverse (2003201112), we get a palindrome (23113431132).

The spelling of 21110230020 in words is "twenty-one billion, one hundred ten million, two hundred thirty thousand, twenty".