1201122021221 has 16 divisors (see below), whose sum is σ = 1212870371328. Its totient is φ = 1189415463600.

The previous prime is 1201122021193. The next prime is 1201122021269. The reversal of 1201122021221 is 1221202211021.

It is a cyclic number.

It is not a de Polignac number, because 1201122021221 - 2³⁸ = 926244114277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201122021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122021521) 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, 147066080 + ... + 147074246.

It is an arithmetic number, because the mean of its divisors is an integer number (75804398208).

Almost surely, 2^{1201122021221} is an apocalyptic number.

It is an amenable number.

1201122021221 is a deficient number, since it is larger than the sum of its proper divisors (11748350107).

1201122021221 is a wasteful number, since it uses less digits than its factorization.

1201122021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1201122021221 its reverse (1221202211021), we get a palindrome (2422324232242).

The spelling of 1201122021221 in words is "one trillion, two hundred one billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".