1220221121001 has 16 divisors (see below), whose sum is σ = 1627956480000. Its totient is φ = 812983417488.

The previous prime is 1220221120999. The next prime is 1220221121069. The reversal of 1220221121001 is 1001211220221.

It is not a de Polignac number, because 1220221121001 - 2¹ = 1220221120999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220221123001) 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, 36214080 + ... + 36247758.

It is an arithmetic number, because the mean of its divisors is an integer number (101747280000).

Almost surely, 2^{1220221121001} is an apocalyptic number.

It is an amenable number.

1220221121001 is a deficient number, since it is larger than the sum of its proper divisors (407735358999).

1220221121001 is a wasteful number, since it uses less digits than its factorization.

1220221121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40708.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220221121001 its reverse (1001211220221), we get a palindrome (2221432341222).

The spelling of 1220221121001 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, one".