1221021012001 has 8 divisors (see below), whose sum is σ = 1456124436864. Its totient is φ = 1001085550080.

The previous prime is 1221021011993. The next prime is 1221021012031. The reversal of 1221021012001 is 1002101201221.

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

It is not a de Polignac number, because 1221021012001 - 2³ = 1221021011993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221021012031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3791990560 + ... + 3791990881.

It is an arithmetic number, because the mean of its divisors is an integer number (182015554608).

Almost surely, 2^{1221021012001} is an apocalyptic number.

It is an amenable number.

1221021012001 is a deficient number, since it is larger than the sum of its proper divisors (235103424863).

1221021012001 is an equidigital number, since it uses as much as digits as its factorization.

1221021012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7583981471.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221021012001 its reverse (1002101201221), we get a palindrome (2223122213222).

The spelling of 1221021012001 in words is "one trillion, two hundred twenty-one billion, twenty-one million, twelve thousand, one".