21420140411 has 2 divisors, whose sum is σ = 21420140412. Its totient is φ = 21420140410.

The previous prime is 21420140387. The next prime is 21420140453. The reversal of 21420140411 is 11404102412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21420140411 - 2²² = 21415946107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21420140461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710070205 + 10710070206.

It is an arithmetic number, because the mean of its divisors is an integer number (10710070206).

Almost surely, 2^21420140411 is an apocalyptic number.

21420140411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420140411 is an equidigital number, since it uses as much as digits as its factorization.

21420140411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21420140411 its reverse (11404102412), we get a palindrome (32824242823).

The spelling of 21420140411 in words is "twenty-one billion, four hundred twenty million, one hundred forty thousand, four hundred eleven".