20021200501 has 4 divisors (see below), whose sum is σ = 20246157900. Its totient is φ = 19796243104.

The previous prime is 20021200457. The next prime is 20021200519. The reversal of 20021200501 is 10500212002.

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 9427439025 + 10593761476 = 97095^2 + 102926^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021200501 - 2¹⁷ = 20021069429 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 (20021207501) 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, 112478566 + ... + 112478743.

It is an arithmetic number, because the mean of its divisors is an integer number (5061539475).

Almost surely, 2^20021200501 is an apocalyptic number.

It is an amenable number.

20021200501 is a deficient number, since it is larger than the sum of its proper divisors (224957399).

20021200501 is an equidigital number, since it uses as much as digits as its factorization.

20021200501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224957398.

The product of its (nonzero) digits is 40, while the sum is 13.

Adding to 20021200501 its reverse (10500212002), we get a palindrome (30521412503).

The spelling of 20021200501 in words is "twenty billion, twenty-one million, two hundred thousand, five hundred one".