1213101940 has 24 divisors (see below), whose sum is σ = 2555563752. Its totient is φ = 483707520.

The previous prime is 1213101919. The next prime is 1213101991. The reversal of 1213101940 is 491013121.

It can be written as a sum of positive squares in 4 ways, for example, as 131744484 + 1081357456 = 11478^2 + 32884^2 .

It is a congruent number.

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, 89331 + ... + 102010.

It is an arithmetic number, because the mean of its divisors is an integer number (106481823).

Almost surely, 2^1213101940 is an apocalyptic number.

1213101940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213101940 is an abundant number, since it is smaller than the sum of its proper divisors (1342461812).

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

1213101940 is a wasteful number, since it uses less digits than its factorization.

1213101940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191667 (or 191665 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1213101940 is about 34829.6129751681. The cubic root of 1213101940 is about 1066.5120476837.

The spelling of 1213101940 in words is "one billion, two hundred thirteen million, one hundred one thousand, nine hundred forty".