21132421011 has 24 divisors (see below), whose sum is σ = 32886243936. Its totient is φ = 12999191040.

The previous prime is 21132421001. The next prime is 21132421019. The reversal of 21132421011 is 11012423112.

21132421011 is a `hidden beast` number, since 211 + 32 + 421 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 21132421011 - 2¹⁸ = 21132158867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21132421019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256771 + ... + 328931.

It is an arithmetic number, because the mean of its divisors is an integer number (1370260164).

Almost surely, 2^21132421011 is an apocalyptic number.

21132421011 is a deficient number, since it is larger than the sum of its proper divisors (11753822925).

21132421011 is a wasteful number, since it uses less digits than its factorization.

21132421011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74683 (or 74680 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21132421011 its reverse (11012423112), we get a palindrome (32144844123).

The spelling of 21132421011 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty-one thousand, eleven".