1201220210021 has 16 divisors (see below), whose sum is σ = 1308968434368. Its totient is φ = 1095716064000.

The previous prime is 1201220210011. The next prime is 1201220210059. The reversal of 1201220210021 is 1200120221021.

It is a cyclic number.

It is not a de Polignac number, because 1201220210021 - 2³⁰ = 1200146468197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201220209978 and 1201220210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220210011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518975 + ... + 1634556.

It is an arithmetic number, because the mean of its divisors is an integer number (81810527148).

Almost surely, 2^{1201220210021} is an apocalyptic number.

It is an amenable number.

1201220210021 is a deficient number, since it is larger than the sum of its proper divisors (107748224347).

1201220210021 is a wasteful number, since it uses less digits than its factorization.

1201220210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154052.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1201220210021 its reverse (1200120221021), we get a palindrome (2401340431042).

The spelling of 1201220210021 in words is "one trillion, two hundred one billion, two hundred twenty million, two hundred ten thousand, twenty-one".