20101221001210 has 16 divisors (see below), whose sum is σ = 37349365473792. Its totient is φ = 7781117806800.

The previous prime is 20101221001207. The next prime is 20101221001217. The reversal of 20101221001210 is 1210012210102.

It is not an unprimeable number, because it can be changed into a prime (20101221001217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32421323886 + ... + 32421324505.

It is an arithmetic number, because the mean of its divisors is an integer number (2334335342112).

Almost surely, 2^{20101221001210} is an apocalyptic number.

20101221001210 is a deficient number, since it is larger than the sum of its proper divisors (17248144472582).

20101221001210 is a wasteful number, since it uses less digits than its factorization.

20101221001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64842648429.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101221001210 its reverse (1210012210102), we get a palindrome (21311233211312).

The spelling of 20101221001210 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, one thousand, two hundred ten".