20101221010012 has 12 divisors (see below), whose sum is σ = 35178343610256. Its totient is φ = 10050265692800.

The previous prime is 20101221009997. The next prime is 20101221010043. The reversal of 20101221010012 is 21001012210102.

It is a junction number, because it is equal to n+sod(n) for n = 20101221009974 and 20101221010001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86071864 + ... + 86305087.

It is an arithmetic number, because the mean of its divisors is an integer number (2931528634188).

Almost surely, 2^{20101221010012} is an apocalyptic number.

It is an amenable number.

20101221010012 is a deficient number, since it is larger than the sum of its proper divisors (15077122600244).

20101221010012 is a wasteful number, since it uses less digits than its factorization.

20101221010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172406108 (or 172406106 counting only the distinct ones).

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

Adding to 20101221010012 its reverse (21001012210102), we get a palindrome (41102233220114).

The spelling of 20101221010012 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, ten thousand, twelve".