20101220201212 has 24 divisors (see below), whose sum is σ = 35932613080896. Its totient is φ = 9834842988288.

The previous prime is 20101220201171. The next prime is 20101220201267. The reversal of 20101220201212 is 21210202210102.

It is a happy number.

It is a super-2 number, since 2×20101220201212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 9494593 + ... + 11417080.

It is an arithmetic number, because the mean of its divisors is an integer number (1497192211704).

Almost surely, 2^{20101220201212} is an apocalyptic number.

It is an amenable number.

20101220201212 is a deficient number, since it is larger than the sum of its proper divisors (15831392879684).

20101220201212 is a wasteful number, since it uses less digits than its factorization.

20101220201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20916837 (or 20916835 counting only the distinct ones).

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

Adding to 20101220201212 its reverse (21210202210102), we get a palindrome (41311422411314).

The spelling of 20101220201212 in words is "twenty trillion, one hundred one billion, two hundred twenty million, two hundred one thousand, two hundred twelve".