1211432330021 has 4 divisors (see below), whose sum is σ = 1223921323212. Its totient is φ = 1198943336832.

The previous prime is 1211432329997. The next prime is 1211432330131. The reversal of 1211432330021 is 1200332341121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 517608302500 + 693824027521 = 719450^2 + 832961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211432330021 is a prime.

It is a super-3 number, since 3×1211432330021³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211432330621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6244496450 + ... + 6244496643.

It is an arithmetic number, because the mean of its divisors is an integer number (305980330803).

Almost surely, 2^{1211432330021} is an apocalyptic number.

It is an amenable number.

1211432330021 is a deficient number, since it is larger than the sum of its proper divisors (12488993191).

1211432330021 is an equidigital number, since it uses as much as digits as its factorization.

1211432330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12488993190.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1211432330021 its reverse (1200332341121), we get a palindrome (2411764671142).

The spelling of 1211432330021 in words is "one trillion, two hundred eleven billion, four hundred thirty-two million, three hundred thirty thousand, twenty-one".