21114324021 has 16 divisors (see below), whose sum is σ = 32186000000. Its totient is φ = 12060906048.

The previous prime is 21114323977. The next prime is 21114324061. The reversal of 21114324021 is 12042341112.

It is not a de Polignac number, because 21114324021 - 2¹⁴ = 21114307637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114324061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125146 + ... + 240603.

It is an arithmetic number, because the mean of its divisors is an integer number (2011625000).

Almost surely, 2^21114324021 is an apocalyptic number.

21114324021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21114324021 is a deficient number, since it is larger than the sum of its proper divisors (11071675979).

21114324021 is a wasteful number, since it uses less digits than its factorization.

21114324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368508.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21114324021 its reverse (12042341112), we get a palindrome (33156665133).

The spelling of 21114324021 in words is "twenty-one billion, one hundred fourteen million, three hundred twenty-four thousand, twenty-one".