1201221202021 has 16 divisors (see below), whose sum is σ = 1209475643904. Its totient is φ = 1192999339584.

The previous prime is 1201221202003. The next prime is 1201221202057. The reversal of 1201221202021 is 1202021221021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201221202021 - 2¹⁹ = 1201220677733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201221201986 and 1201221202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221202081) 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, 236132940 + ... + 236138026.

It is an arithmetic number, because the mean of its divisors is an integer number (75592227744).

Almost surely, 2^{1201221202021} is an apocalyptic number.

It is an amenable number.

1201221202021 is a deficient number, since it is larger than the sum of its proper divisors (8254441883).

1201221202021 is a wasteful number, since it uses less digits than its factorization.

1201221202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7980.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1201221202021 its reverse (1202021221021), we get a palindrome (2403242423042).

The spelling of 1201221202021 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred two thousand, twenty-one".