11202021421 has 2 divisors, whose sum is σ = 11202021422. Its totient is φ = 11202021420.

The previous prime is 11202021409. The next prime is 11202021431. The reversal of 11202021421 is 12412020211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7171549225 + 4030472196 = 84685^2 + 63486^2 .

It is a cyclic number.

It is not a de Polignac number, because 11202021421 - 2⁹ = 11202020909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11202021395 and 11202021404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11202021431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5601010710 + 5601010711.

It is an arithmetic number, because the mean of its divisors is an integer number (5601010711).

Almost surely, 2^11202021421 is an apocalyptic number.

It is an amenable number.

11202021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11202021421 is an equidigital number, since it uses as much as digits as its factorization.

11202021421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11202021421 its reverse (12412020211), we get a palindrome (23614041632).

The spelling of 11202021421 in words is "eleven billion, two hundred two million, twenty-one thousand, four hundred twenty-one".