20021102021000 has 128 divisors (see below), whose sum is σ = 47302269580800. Its totient is φ = 7931071283200.

The previous prime is 20021102020991. The next prime is 20021102021003. The reversal of 20021102021000 is 12020112002.

It is a happy number.

It is a super-2 number, since 2×20021102021000² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20021102021003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356174897 + ... + 356231103.

It is an arithmetic number, because the mean of its divisors is an integer number (369548981100).

Almost surely, 2^{20021102021000} is an apocalyptic number.

20021102021000 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 20021102021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23651134790400).

20021102021000 is an abundant number, since it is smaller than the sum of its proper divisors (27281167559800).

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

20021102021000 is a wasteful number, since it uses less digits than its factorization.

20021102021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59664 (or 59650 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021102021000 its reverse (12020112002), we get a palindrome (20033122133002).

The spelling of 20021102021000 in words is "twenty trillion, twenty-one billion, one hundred two million, twenty-one thousand".