1213132021 has 8 divisors (see below), whose sum is σ = 1255106304. Its totient is φ = 1171335360.

The previous prime is 1213132013. The next prime is 1213132049. The reversal of 1213132021 is 1202313121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213132021 - 2³ = 1213132013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213131986 and 1213132004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213132001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30436 + ... + 57901.

It is an arithmetic number, because the mean of its divisors is an integer number (156888288).

Almost surely, 2^1213132021 is an apocalyptic number.

It is an amenable number.

1213132021 is a deficient number, since it is larger than the sum of its proper divisors (41974283).

1213132021 is an equidigital number, since it uses as much as digits as its factorization.

1213132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88811.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1213132021 is about 34830.0448033016. The cubic root of 1213132021 is about 1066.5208629593.

Adding to 1213132021 its reverse (1202313121), we get a palindrome (2415445142).

The spelling of 1213132021 in words is "one billion, two hundred thirteen million, one hundred thirty-two thousand, twenty-one".