1201021999999 has 8 divisors (see below), whose sum is σ = 1202244851808. Its totient is φ = 1199799654240.

The previous prime is 1201021999987. The next prime is 1201022000029. The reversal of 1201021999999 is 9999991201021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201021999999 - 2¹⁵ = 1201021967231 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 (1201021999799) 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, 4716489 + ... + 4964605.

It is an arithmetic number, because the mean of its divisors is an integer number (150280606476).

Almost surely, 2^{1201021999999} is an apocalyptic number.

1201021999999 is a deficient number, since it is larger than the sum of its proper divisors (1222851809).

1201021999999 is a wasteful number, since it uses less digits than its factorization.

1201021999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253025.

The product of its (nonzero) digits is 2125764, while the sum is 61.

The spelling of 1201021999999 in words is "one trillion, two hundred one billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".