2002121321545 has 4 divisors (see below), whose sum is σ = 2402545585860. Its totient is φ = 1601697057232.

The previous prime is 2002121321509. The next prime is 2002121321573. The reversal of 2002121321545 is 5451231212002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 814101980176 + 1188019341369 = 902276^2 + 1089963^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002121321545 - 2¹⁷ = 2002121190473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200212132150 + ... + 200212132159.

It is an arithmetic number, because the mean of its divisors is an integer number (600636396465).

Almost surely, 2^{2002121321545} is an apocalyptic number.

It is an amenable number.

2002121321545 is a deficient number, since it is larger than the sum of its proper divisors (400424264315).

2002121321545 is an equidigital number, since it uses as much as digits as its factorization.

2002121321545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400424264314.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 2002121321545 its reverse (5451231212002), we get a palindrome (7453352533547).

The spelling of 2002121321545 in words is "two trillion, two billion, one hundred twenty-one million, three hundred twenty-one thousand, five hundred forty-five".