20021102291 has 8 divisors (see below), whose sum is σ = 20440772064. Its totient is φ = 19602984960.

The previous prime is 20021102221. The next prime is 20021102327. The reversal of 20021102291 is 19220112002.

It is a happy number.

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 20021102291 - 2¹⁰ = 20021101267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021102221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362030 + ... + 413651.

It is an arithmetic number, because the mean of its divisors is an integer number (2555096508).

Almost surely, 2^20021102291 is an apocalyptic number.

20021102291 is a deficient number, since it is larger than the sum of its proper divisors (419669773).

20021102291 is an equidigital number, since it uses as much as digits as its factorization.

20021102291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776221.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20021102291 its reverse (19220112002), we get a palindrome (39241214293).

The spelling of 20021102291 in words is "twenty billion, twenty-one million, one hundred two thousand, two hundred ninety-one".