1221020131001 has 16 divisors (see below), whose sum is σ = 1336713401088. Its totient is φ = 1106112123600.

The previous prime is 1221020130989. The next prime is 1221020131027. The reversal of 1221020131001 is 1001310201221.

It is not a de Polignac number, because 1221020131001 - 2²² = 1221015936697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221020131031) 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, 7297586 + ... + 7463028.

It is an arithmetic number, because the mean of its divisors is an integer number (83544587568).

Almost surely, 2^{1221020131001} is an apocalyptic number.

1221020131001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221020131001 is a deficient number, since it is larger than the sum of its proper divisors (115693270087).

1221020131001 is a wasteful number, since it uses less digits than its factorization.

1221020131001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167812.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221020131001 its reverse (1001310201221), we get a palindrome (2222330332222).

The spelling of 1221020131001 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred thirty-one thousand, one".