21120011421 has 32 divisors (see below), whose sum is σ = 30795264000. Its totient is φ = 12817232640.

The previous prime is 21120011401. The next prime is 21120011449. The reversal of 21120011421 is 12411002112.

It is not a de Polignac number, because 21120011421 - 2⁹ = 21120010909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120011421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120011401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5150430 + ... + 5154528.

It is an arithmetic number, because the mean of its divisors is an integer number (962352000).

Almost surely, 2^21120011421 is an apocalyptic number.

It is an amenable number.

21120011421 is a deficient number, since it is larger than the sum of its proper divisors (9675252579).

21120011421 is a wasteful number, since it uses less digits than its factorization.

21120011421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7409.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120011421 its reverse (12411002112), we get a palindrome (33531013533).

The spelling of 21120011421 in words is "twenty-one billion, one hundred twenty million, eleven thousand, four hundred twenty-one".