1211102020 has 48 divisors (see below), whose sum is σ = 2570335488. Its totient is φ = 479324160.

The previous prime is 1211101999. The next prime is 1211102033. The reversal of 1211102020 is 202011121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1211101988 and 1211102006.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 813717 + ... + 815203.

It is an arithmetic number, because the mean of its divisors is an integer number (53548656).

Almost surely, 2^1211102020 is an apocalyptic number.

1211102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211102020 is an abundant number, since it is smaller than the sum of its proper divisors (1359233468).

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

1211102020 is a wasteful number, since it uses less digits than its factorization.

1211102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900 (or 1898 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1211102020 is about 34800.8910805456. The cubic root of 1211102020 is about 1065.9256413536.

Adding to 1211102020 its reverse (202011121), we get a palindrome (1413113141).

The spelling of 1211102020 in words is "one billion, two hundred eleven million, one hundred two thousand, twenty".