1211202120 has 64 divisors (see below), whose sum is σ = 3824856000. Its totient is φ = 305987328.

The previous prime is 1211202107. The next prime is 1211202121. The reversal of 1211202120 is 212021121.

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 = 1211202096 and 1211202105.

It is not an unprimeable number, because it can be changed into a prime (1211202121) 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, 263335 + ... + 267894.

It is an arithmetic number, because the mean of its divisors is an integer number (59763375).

Almost surely, 2^1211202120 is an apocalyptic number.

1211202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211202120 is an abundant number, since it is smaller than the sum of its proper divisors (2613653880).

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

1211202120 is a wasteful number, since it uses less digits than its factorization.

1211202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531262 (or 531258 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1211202120 is about 34802.3292323948. The cubic root of 1211202120 is about 1065.9550075054.

Adding to 1211202120 its reverse (212021121), we get a palindrome (1423223241).

The spelling of 1211202120 in words is "one billion, two hundred eleven million, two hundred two thousand, one hundred twenty".