20101221020212 has 24 divisors (see below), whose sum is σ = 36078725434752. Its totient is φ = 9794098372800.

The previous prime is 20101221020203. The next prime is 20101221020219. The reversal of 20101221020212 is 21202012210102.

It is a happy number.

It is a super-2 number, since 2×20101221020212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101221020219) 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, 135503089 + ... + 135651352.

It is an arithmetic number, because the mean of its divisors is an integer number (1503280226448).

Almost surely, 2^{20101221020212} is an apocalyptic number.

It is an amenable number.

20101221020212 is a deficient number, since it is larger than the sum of its proper divisors (15977504414540).

20101221020212 is a wasteful number, since it uses less digits than its factorization.

20101221020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271154919 (or 271154917 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20101221020212 its reverse (21202012210102), we get a palindrome (41303233230314).

The spelling of 20101221020212 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, twenty thousand, two hundred twelve".