20101220012 has 48 divisors (see below), whose sum is σ = 38321095680. Its totient is φ = 9190843200.

The previous prime is 20101220011. The next prime is 20101220099. The reversal of 20101220012 is 21002210102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20101219975 and 20101220002.

It is not an unprimeable number, because it can be changed into a prime (20101220011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924587 + ... + 946077.

It is an arithmetic number, because the mean of its divisors is an integer number (798356160).

Almost surely, 2^20101220012 is an apocalyptic number.

It is an amenable number.

20101220012 is a deficient number, since it is larger than the sum of its proper divisors (18219875668).

20101220012 is a wasteful number, since it uses less digits than its factorization.

20101220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21942 (or 21940 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20101220012 its reverse (21002210102), we get a palindrome (41103430114).

The spelling of 20101220012 in words is "twenty billion, one hundred one million, two hundred twenty thousand, twelve".