1200001222021 has 16 divisors (see below), whose sum is σ = 1377573934464. Its totient is φ = 1023966157824.

The previous prime is 1200001221953. The next prime is 1200001222031. The reversal of 1200001222021 is 1202221000021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1200001222021 - 2¹⁷ = 1200001090949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200001221992 and 1200001222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001222031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9007125 + ... + 9139381.

It is an arithmetic number, because the mean of its divisors is an integer number (86098370904).

Almost surely, 2^{1200001222021} is an apocalyptic number.

It is an amenable number.

1200001222021 is a deficient number, since it is larger than the sum of its proper divisors (177572712443).

1200001222021 is a wasteful number, since it uses less digits than its factorization.

1200001222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138060.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1200001222021 its reverse (1202221000021), we get a palindrome (2402222222042).

The spelling of 1200001222021 in words is "one trillion, two hundred billion, one million, two hundred twenty-two thousand, twenty-one".