20733421801 has 4 divisors (see below), whose sum is σ = 20814096852. Its totient is φ = 20652746752.

The previous prime is 20733421781. The next prime is 20733421831. The reversal of 20733421801 is 10812433702.

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 16893760576 + 3839661225 = 129976^2 + 61965^2 .

It is a cyclic number.

It is not a de Polignac number, because 20733421801 - 2¹¹ = 20733419753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20733421831) 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, 40337140 + ... + 40337653.

It is an arithmetic number, because the mean of its divisors is an integer number (5203524213).

Almost surely, 2^20733421801 is an apocalyptic number.

It is an amenable number.

20733421801 is a deficient number, since it is larger than the sum of its proper divisors (80675051).

20733421801 is an equidigital number, since it uses as much as digits as its factorization.

20733421801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80675050.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 20733421801 in words is "twenty billion, seven hundred thirty-three million, four hundred twenty-one thousand, eight hundred one".