1211310020 has 24 divisors (see below), whose sum is σ = 2544490368. Its totient is φ = 484383200.

The previous prime is 1211310011. The next prime is 1211310031. The reversal of 1211310020 is 200131121.

It is a junction number, because it is equal to n+sod(n) for n = 1211309983 and 1211310010.

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, 87365 + ... + 100275.

It is an arithmetic number, because the mean of its divisors is an integer number (106020432).

Almost surely, 2^1211310020 is an apocalyptic number.

1211310020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211310020 is an abundant number, since it is smaller than the sum of its proper divisors (1333180348).

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

1211310020 is a wasteful number, since it uses less digits than its factorization.

1211310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17611 (or 17609 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1211310020 is about 34803.8793814713. The cubic root of 1211310020 is about 1065.9866601168.

Adding to 1211310020 its reverse (200131121), we get a palindrome (1411441141).

The spelling of 1211310020 in words is "one billion, two hundred eleven million, three hundred ten thousand, twenty".