21111132021 has 48 divisors (see below), whose sum is σ = 32964750720. Its totient is φ = 11982418560.

The previous prime is 21111132011. The next prime is 21111132067. The reversal of 21111132021 is 12023111112.

It is not a de Polignac number, because 21111132021 - 2¹⁴ = 21111115637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111132011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17875051 + ... + 17876231.

It is an arithmetic number, because the mean of its divisors is an integer number (686765640).

Almost surely, 2^21111132021 is an apocalyptic number.

21111132021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21111132021 is a deficient number, since it is larger than the sum of its proper divisors (11853618699).

21111132021 is a wasteful number, since it uses less digits than its factorization.

21111132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21111132021 its reverse (12023111112), we get a palindrome (33134243133).

The spelling of 21111132021 in words is "twenty-one billion, one hundred eleven million, one hundred thirty-two thousand, twenty-one".