1221312322021 has 8 divisors (see below), whose sum is σ = 1332349020288. Its totient is φ = 1110277008000.

The previous prime is 1221312321941. The next prime is 1221312322093. The reversal of 1221312322021 is 1202232131221.

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 1221312322021 - 2²³ = 1221303933413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221312321983 and 1221312322001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221312322121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2559316 + ... + 2998786.

It is an arithmetic number, because the mean of its divisors is an integer number (166543627536).

Almost surely, 2^{1221312322021} is an apocalyptic number.

1221312322021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221312322021 is a deficient number, since it is larger than the sum of its proper divisors (111036698267).

1221312322021 is a wasteful number, since it uses less digits than its factorization.

1221312322021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692123.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221312322021 its reverse (1202232131221), we get a palindrome (2423544453242).

The spelling of 1221312322021 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred twenty-two thousand, twenty-one".