1211332020 has 48 divisors (see below), whose sum is σ = 3423446208. Its totient is φ = 320001280.

The previous prime is 1211331977. The next prime is 1211332021. The reversal of 1211332020 is 202331121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211332021) 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, 87921 + ... + 100760.

It is an arithmetic number, because the mean of its divisors is an integer number (71321796).

Almost surely, 2^1211332020 is an apocalyptic number.

1211332020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211332020 is an abundant number, since it is smaller than the sum of its proper divisors (2212114188).

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

1211332020 is a wasteful number, since it uses less digits than its factorization.

1211332020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188800 (or 188798 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1211332020 is about 34804.1954367573. The cubic root of 1211332020 is about 1065.9931136159.

Adding to 1211332020 its reverse (202331121), we get a palindrome (1413663141).

The spelling of 1211332020 in words is "one billion, two hundred eleven million, three hundred thirty-two thousand, twenty".