921221212001 has 4 divisors (see below), whose sum is σ = 932320262832. Its totient is φ = 910122161172.

The previous prime is 921221211997. The next prime is 921221212019. The reversal of 921221212001 is 100212122129.

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 921221212001 - 2² = 921221211997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921221112001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5549525291 + ... + 5549525456.

It is an arithmetic number, because the mean of its divisors is an integer number (233080065708).

Almost surely, 2^921221212001 is an apocalyptic number.

It is an amenable number.

921221212001 is a deficient number, since it is larger than the sum of its proper divisors (11099050831).

921221212001 is a wasteful number, since it uses less digits than its factorization.

921221212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11099050830.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 921221212001 in words is "nine hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one".