11421650021 has 2 divisors, whose sum is σ = 11421650022. Its totient is φ = 11421650020.

The previous prime is 11421650011. The next prime is 11421650027. The reversal of 11421650021 is 12005612411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9581668996 + 1839981025 = 97886^2 + 42895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11421650021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11421650027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710825010 + 5710825011.

It is an arithmetic number, because the mean of its divisors is an integer number (5710825011).

Almost surely, 2^11421650021 is an apocalyptic number.

It is an amenable number.

11421650021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421650021 is an equidigital number, since it uses as much as digits as its factorization.

11421650021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The spelling of 11421650021 in words is "eleven billion, four hundred twenty-one million, six hundred fifty thousand, twenty-one".