21113024021 has 16 divisors (see below), whose sum is σ = 22134228480. Its totient is φ = 20115068160.

The previous prime is 21113024003. The next prime is 21113024033. The reversal of 21113024021 is 12042031112.

It is a cyclic number.

It is not a de Polignac number, because 21113024021 - 2⁶ = 21113023957 is a prime.

It is a super-2 number, since 2×21113024021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113024221) 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 15 ways as a sum of consecutive naturals, for example, 626426 + ... + 659268.

It is an arithmetic number, because the mean of its divisors is an integer number (1383389280).

Almost surely, 2^21113024021 is an apocalyptic number.

It is an amenable number.

21113024021 is a deficient number, since it is larger than the sum of its proper divisors (1021204459).

21113024021 is a wasteful number, since it uses less digits than its factorization.

21113024021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33196.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21113024021 its reverse (12042031112), we get a palindrome (33155055133).

The spelling of 21113024021 in words is "twenty-one billion, one hundred thirteen million, twenty-four thousand, twenty-one".