1201222220021 has 8 divisors (see below), whose sum is σ = 1206540365184. Its totient is φ = 1195909762960.

The previous prime is 1201222219999. The next prime is 1201222220039. The reversal of 1201222220021 is 1200222221021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201222220021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201222220221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998450 + ... + 1843731.

It is an arithmetic number, because the mean of its divisors is an integer number (150817545648).

Almost surely, 2^{1201222220021} is an apocalyptic number.

It is an amenable number.

1201222220021 is a deficient number, since it is larger than the sum of its proper divisors (5318145163).

1201222220021 is a wasteful number, since it uses less digits than its factorization.

1201222220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844051.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1201222220021 its reverse (1200222221021), we get a palindrome (2401444441042).

The spelling of 1201222220021 in words is "one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".