21112203021 has 32 divisors (see below), whose sum is σ = 35490701568. Its totient is φ = 10864488960.

The previous prime is 21112202983. The next prime is 21112203041. The reversal of 21112203021 is 12030221112.

It is not a de Polignac number, because 21112203021 - 2¹¹ = 21112200973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112203041) 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 31 ways as a sum of consecutive naturals, for example, 931906 + ... + 954291.

It is an arithmetic number, because the mean of its divisors is an integer number (1109084424).

Almost surely, 2^21112203021 is an apocalyptic number.

21112203021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21112203021 is a deficient number, since it is larger than the sum of its proper divisors (14378498547).

21112203021 is a wasteful number, since it uses less digits than its factorization.

21112203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886261.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21112203021 its reverse (12030221112), we get a palindrome (33142424133).

The spelling of 21112203021 in words is "twenty-one billion, one hundred twelve million, two hundred three thousand, twenty-one".