20020021221072 has 160 divisors (see below), whose sum is σ = 54364860426240. Its totient is φ = 6336154344960.

The previous prime is 20020021221061. The next prime is 20020021221073. The reversal of 20020021221072 is 27012212002002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020021221073) 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, 1543914333 + ... + 1543927299.

It is an arithmetic number, because the mean of its divisors is an integer number (339780377664).

Almost surely, 2^{20020021221072} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20020021221072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27182430213120).

20020021221072 is an abundant number, since it is smaller than the sum of its proper divisors (34344839205168).

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

20020021221072 is a wasteful number, since it uses less digits than its factorization.

20020021221072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23201 (or 23195 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

Adding to 20020021221072 its reverse (27012212002002), we get a palindrome (47032233223074).

The spelling of 20020021221072 in words is "twenty trillion, twenty billion, twenty-one million, two hundred twenty-one thousand, seventy-two".