20021321310000 has 800 divisors, whose sum is σ = 68680649157120. Its totient is φ = 5015270400000.

The previous prime is 20021321309993. The next prime is 20021321310013. The reversal of 20021321310000 is 1312312002.

It is a super-2 number, since 2×20021321310000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 20367569509 + ... + 20367570491.

Almost surely, 2^{20021321310000} is an apocalyptic number.

20021321310000 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 20021321310000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34340324578560).

20021321310000 is an abundant number, since it is smaller than the sum of its proper divisors (48659327847120).

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

20021321310000 is a wasteful number, since it uses less digits than its factorization.

20021321310000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20021321310000 its reverse (1312312002), we get a palindrome (20022633622002).

The spelling of 20021321310000 in words is "twenty trillion, twenty-one billion, three hundred twenty-one million, three hundred ten thousand".