21420210411 has 48 divisors (see below), whose sum is σ = 31732856064. Its totient is φ = 13919729472.

The previous prime is 21420210407. The next prime is 21420210433. The reversal of 21420210411 is 11401202412.

21420210411 is a `hidden beast` number, since 2 + 1 + 42 + 0 + 210 + 411 = 666.

It is not a de Polignac number, because 21420210411 - 2² = 21420210407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21420210491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34942941 + ... + 34943553.

It is an arithmetic number, because the mean of its divisors is an integer number (661101168).

Almost surely, 2^21420210411 is an apocalyptic number.

21420210411 is a deficient number, since it is larger than the sum of its proper divisors (10312645653).

21420210411 is a wasteful number, since it uses less digits than its factorization.

21420210411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21420210411 its reverse (11401202412), we get a palindrome (32821412823).

The spelling of 21420210411 in words is "twenty-one billion, four hundred twenty million, two hundred ten thousand, four hundred eleven".