1221010012001 has 16 divisors (see below), whose sum is σ = 1403245799424. Its totient is φ = 1052434301184.

The previous prime is 1221010011997. The next prime is 1221010012031. The reversal of 1221010012001 is 1002100101221.

It is a cyclic number.

It is not a de Polignac number, because 1221010012001 - 2² = 1221010011997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221010012031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21723635 + ... + 21779768.

It is an arithmetic number, because the mean of its divisors is an integer number (87702862464).

Almost surely, 2^{1221010012001} is an apocalyptic number.

It is an amenable number.

1221010012001 is a deficient number, since it is larger than the sum of its proper divisors (182235787423).

1221010012001 is a wasteful number, since it uses less digits than its factorization.

1221010012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43503560.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221010012001 its reverse (1002100101221), we get a palindrome (2223110113222).

The spelling of 1221010012001 in words is "one trillion, two hundred twenty-one billion, ten million, twelve thousand, one".