20421002311 has 2 divisors, whose sum is σ = 20421002312. Its totient is φ = 20421002310.

The previous prime is 20421002299. The next prime is 20421002351. The reversal of 20421002311 is 11320012402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20421002311 - 2⁷ = 20421002183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421002351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210501155 + 10210501156.

It is an arithmetic number, because the mean of its divisors is an integer number (10210501156).

Almost surely, 2^20421002311 is an apocalyptic number.

20421002311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421002311 is an equidigital number, since it uses as much as digits as its factorization.

20421002311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20421002311 its reverse (11320012402), we get a palindrome (31741014713).

The spelling of 20421002311 in words is "twenty billion, four hundred twenty-one million, two thousand, three hundred eleven".