20201221001210 has 16 divisors (see below), whose sum is σ = 36380627740296. Its totient is φ = 8076392858688.

The previous prime is 20201221001207. The next prime is 20201221001237. The reversal of 20201221001210 is 1210012210202.

It can be written as a sum of positive squares in 4 ways, for example, as 16011450047761 + 4189770953449 = 4001431^2 + 2046893^2 .

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, 511922009 + ... + 511961468.

Almost surely, 2^{20201221001210} is an apocalyptic number.

20201221001210 is a deficient number, since it is larger than the sum of its proper divisors (16179406739086).

20201221001210 is a wasteful number, since it uses less digits than its factorization.

20201221001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023885457.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20201221001210 its reverse (1210012210202), we get a palindrome (21411233211412).

The spelling of 20201221001210 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, one thousand, two hundred ten".