1221000020101 has 8 divisors (see below), whose sum is σ = 1263211603200. Its totient is φ = 1178795646000.

The previous prime is 1221000020077. The next prime is 1221000020111. The reversal of 1221000020101 is 1010200001221.

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 1221000020101 - 2¹³ = 1221000011909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000020111) 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, 1456525 + ... + 2136226.

It is an arithmetic number, because the mean of its divisors is an integer number (157901450400).

Almost surely, 2^{1221000020101} is an apocalyptic number.

It is an amenable number.

1221000020101 is a deficient number, since it is larger than the sum of its proper divisors (42211583099).

1221000020101 is a wasteful number, since it uses less digits than its factorization.

1221000020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604499.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221000020101 its reverse (1010200001221), we get a palindrome (2231200021322).

The spelling of 1221000020101 in words is "one trillion, two hundred twenty-one billion, twenty thousand, one hundred one".