1211012020100 has 72 divisors (see below), whose sum is σ = 2645493177600. Its totient is φ = 481171264000.

The previous prime is 1211012020027. The next prime is 1211012020109. The reversal of 1211012020100 is 10202101121.

It is a super-2 number, since 2×1211012020100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211012020109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9520721 + ... + 9647079.

It is an arithmetic number, because the mean of its divisors is an integer number (36742960800).

Almost surely, 2^{1211012020100} is an apocalyptic number.

1211012020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211012020100 is an abundant number, since it is smaller than the sum of its proper divisors (1434481157500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211012020100 is a wasteful number, since it uses less digits than its factorization.

1211012020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127013 (or 127006 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211012020100 its reverse (10202101121), we get a palindrome (1221214121221).

The spelling of 1211012020100 in words is "one trillion, two hundred eleven billion, twelve million, twenty thousand, one hundred".