200020323021521 has 4 divisors (see below), whose sum is σ = 200332367207844. Its totient is φ = 199708278835200.

The previous prime is 200020323021511. The next prime is 200020323021523. The reversal of 200020323021521 is 125120323020002.

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 158647627891600 + 41372695129921 = 12595540^2 + 6432161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200020323021521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200020323021523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156022092200 + ... + 156022093481.

It is an arithmetic number, because the mean of its divisors is an integer number (50083091801961).

Almost surely, 2^{200020323021521} is an apocalyptic number.

It is an amenable number.

200020323021521 is a deficient number, since it is larger than the sum of its proper divisors (312044186323).

200020323021521 is an equidigital number, since it uses as much as digits as its factorization.

200020323021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312044186322.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 200020323021521 its reverse (125120323020002), we get a palindrome (325140646041523).

The spelling of 200020323021521 in words is "two hundred trillion, twenty billion, three hundred twenty-three million, twenty-one thousand, five hundred twenty-one".