21112041021 has 8 divisors (see below), whose sum is σ = 29373274560. Its totient is φ = 13462750752.

The previous prime is 21112041019. The next prime is 21112041053. The reversal of 21112041021 is 12014021112.

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

It is not a de Polignac number, because 21112041021 - 2¹ = 21112041019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112041001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152985736 + ... + 152985873.

It is an arithmetic number, because the mean of its divisors is an integer number (3671659320).

Almost surely, 2^21112041021 is an apocalyptic number.

It is an amenable number.

21112041021 is a deficient number, since it is larger than the sum of its proper divisors (8261233539).

21112041021 is a wasteful number, since it uses less digits than its factorization.

21112041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305971635.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112041021 its reverse (12014021112), we get a palindrome (33126062133).

The spelling of 21112041021 in words is "twenty-one billion, one hundred twelve million, forty-one thousand, twenty-one".