1211322110021 has 4 divisors (see below), whose sum is σ = 1217409156000. Its totient is φ = 1205235064044.

The previous prime is 1211322109973. The next prime is 1211322110027. The reversal of 1211322110021 is 1200112231121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211322110021 - 2⁶ = 1211322109957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211322110027) 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, 3043522691 + ... + 3043523088.

It is an arithmetic number, because the mean of its divisors is an integer number (304352289000).

Almost surely, 2^{1211322110021} is an apocalyptic number.

It is an amenable number.

1211322110021 is a deficient number, since it is larger than the sum of its proper divisors (6087045979).

1211322110021 is an equidigital number, since it uses as much as digits as its factorization.

1211322110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087045978.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211322110021 its reverse (1200112231121), we get a palindrome (2411434341142).

The spelling of 1211322110021 in words is "one trillion, two hundred eleven billion, three hundred twenty-two million, one hundred ten thousand, twenty-one".