2121203201555 has 8 divisors (see below), whose sum is σ = 2695175832672. Its totient is φ = 1597141234048.

The previous prime is 2121203201549. The next prime is 2121203201561. The reversal of 2121203201555 is 5551023021212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121203201549) and next prime (2121203201561).

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 2121203201555 - 2⁴ = 2121203201539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12477665807 + ... + 12477665976.

It is an arithmetic number, because the mean of its divisors is an integer number (336896979084).

Almost surely, 2^{2121203201555} is an apocalyptic number.

2121203201555 is a deficient number, since it is larger than the sum of its proper divisors (573972631117).

2121203201555 is a wasteful number, since it uses less digits than its factorization.

2121203201555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24955331805.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 2121203201555 its reverse (5551023021212), we get a palindrome (7672226222767).

The spelling of 2121203201555 in words is "two trillion, one hundred twenty-one billion, two hundred three million, two hundred one thousand, five hundred fifty-five".