20021121024 has 104 divisors (see below), whose sum is σ = 53985898080. Its totient is φ = 6598361088.

The previous prime is 20021121019. The next prime is 20021121037. The reversal of 20021121024 is 42012112002.

It is a junction number, because it is equal to n+sod(n) for n = 20021120994 and 20021121012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084479 + ... + 1102785.

Almost surely, 2^20021121024 is an apocalyptic number.

20021121024 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 20021121024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26992949040).

20021121024 is an abundant number, since it is smaller than the sum of its proper divisors (33964777056).

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

20021121024 is an equidigital number, since it uses as much as digits as its factorization.

20021121024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18423 (or 18401 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021121024 its reverse (42012112002), we get a palindrome (62033233026).

The spelling of 20021121024 in words is "twenty billion, twenty-one million, one hundred twenty-one thousand, twenty-four".