11020020421 has 2 divisors, whose sum is σ = 11020020422. Its totient is φ = 11020020420.

The previous prime is 11020020419. The next prime is 11020020499. The reversal of 11020020421 is 12402002011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7746464196 + 3273556225 = 88014^2 + 57215^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020020421 - 2¹ = 11020020419 is a prime.

Together with 11020020419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11060020421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510010210 + 5510010211.

It is an arithmetic number, because the mean of its divisors is an integer number (5510010211).

Almost surely, 2^11020020421 is an apocalyptic number.

It is an amenable number.

11020020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020020421 is an equidigital number, since it uses as much as digits as its factorization.

11020020421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 11020020421 its reverse (12402002011), we get a palindrome (23422022432).

The spelling of 11020020421 in words is "eleven billion, twenty million, twenty thousand, four hundred twenty-one".