21142120411 has 2 divisors, whose sum is σ = 21142120412. Its totient is φ = 21142120410.

The previous prime is 21142120387. The next prime is 21142120429. The reversal of 21142120411 is 11402124112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21142120411 - 2⁹ = 21142119899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21142120471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571060205 + 10571060206.

It is an arithmetic number, because the mean of its divisors is an integer number (10571060206).

Almost surely, 2^21142120411 is an apocalyptic number.

21142120411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142120411 is an equidigital number, since it uses as much as digits as its factorization.

21142120411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21142120411 its reverse (11402124112), we get a palindrome (32544244523).

The spelling of 21142120411 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, four hundred eleven".