1221122121001 has 4 divisors (see below), whose sum is σ = 1221234584400. Its totient is φ = 1221009657604.

The previous prime is 1221122120987. The next prime is 1221122121029. The reversal of 1221122121001 is 1001212211221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221122121001 - 2⁵ = 1221122120969 is a prime.

It is a super-2 number, since 2×1221122121001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221122121071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56215411 + ... + 56237128.

It is an arithmetic number, because the mean of its divisors is an integer number (305308646100).

Almost surely, 2^{1221122121001} is an apocalyptic number.

It is an amenable number.

1221122121001 is a deficient number, since it is larger than the sum of its proper divisors (112463399).

1221122121001 is a wasteful number, since it uses less digits than its factorization.

1221122121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112463398.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221122121001 its reverse (1001212211221), we get a palindrome (2222334332222).

The spelling of 1221122121001 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, one".