21024112021 has 8 divisors (see below), whose sum is σ = 23932586304. Its totient is φ = 18281836320.

The previous prime is 21024112019. The next prime is 21024112063. The reversal of 21024112021 is 12021142012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21024112021 - 2¹ = 21024112019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21024111986 and 21024112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024112321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41549376 + ... + 41549881.

It is an arithmetic number, because the mean of its divisors is an integer number (2991573288).

Almost surely, 2^21024112021 is an apocalyptic number.

It is an amenable number.

21024112021 is a deficient number, since it is larger than the sum of its proper divisors (2908474283).

21024112021 is a wasteful number, since it uses less digits than its factorization.

21024112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83099291.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21024112021 its reverse (12021142012), we get a palindrome (33045254033).

The spelling of 21024112021 in words is "twenty-one billion, twenty-four million, one hundred twelve thousand, twenty-one".