21141145021 has 2 divisors, whose sum is σ = 21141145022. Its totient is φ = 21141145020.

The previous prime is 21141145013. The next prime is 21141145057. The reversal of 21141145021 is 12054114112.

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., 15994660900 + 5146484121 = 126470^2 + 71739^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141145021 - 2³ = 21141145013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21141144983 and 21141145001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141145121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570572510 + 10570572511.

It is an arithmetic number, because the mean of its divisors is an integer number (10570572511).

Almost surely, 2^21141145021 is an apocalyptic number.

It is an amenable number.

21141145021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141145021 is an equidigital number, since it uses as much as digits as its factorization.

21141145021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 21141145021 its reverse (12054114112), we get a palindrome (33195259133).

The spelling of 21141145021 in words is "twenty-one billion, one hundred forty-one million, one hundred forty-five thousand, twenty-one".