20021221112010 has 64 divisors (see below), whose sum is σ = 48956233334400. Its totient is φ = 5239266540800.

The previous prime is 20021221111987. The next prime is 20021221112021. The reversal of 20021221112010 is 1021112212002.

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 31 ways as a sum of consecutive naturals, for example, 26611041 + ... + 27353060.

It is an arithmetic number, because the mean of its divisors is an integer number (764941145850).

Almost surely, 2^{20021221112010} is an apocalyptic number.

20021221112010 is an abundant number, since it is smaller than the sum of its proper divisors (28935012222390).

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

20021221112010 is a wasteful number, since it uses less digits than its factorization.

20021221112010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53964343.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021221112010 its reverse (1021112212002), we get a palindrome (21042333324012).

The spelling of 20021221112010 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, ten".