1211113020 has 48 divisors (see below), whose sum is σ = 3651973920. Its totient is φ = 298119936.

The previous prime is 1211113003. The next prime is 1211113027. The reversal of 1211113020 is 203111121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1211112987 and 1211113005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211113027) 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, 775575 + ... + 777134.

It is an arithmetic number, because the mean of its divisors is an integer number (76082790).

Almost surely, 2^1211113020 is an apocalyptic number.

1211113020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211113020 is an abundant number, since it is smaller than the sum of its proper divisors (2440860900).

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

1211113020 is a wasteful number, since it uses less digits than its factorization.

1211113020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552734 (or 1552732 counting only the distinct ones).

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

The square root of 1211113020 is about 34801.0491221170. The cubic root of 1211113020 is about 1065.9288684824.

Adding to 1211113020 its reverse (203111121), we get a palindrome (1414224141).

The spelling of 1211113020 in words is "one billion, two hundred eleven million, one hundred thirteen thousand, twenty".