21213000441 has 32 divisors (see below), whose sum is σ = 32994385920. Its totient is φ = 13444078032.

The previous prime is 21213000439. The next prime is 21213000451. The reversal of 21213000441 is 14400031212.

21213000441 is a `hidden beast` number, since 212 + 13 + 0 + 0 + 0 + 441 = 666.

It is not a de Polignac number, because 21213000441 - 2¹ = 21213000439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213000451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3561 + ... + 206006.

It is an arithmetic number, because the mean of its divisors is an integer number (1031074560).

Almost surely, 2^21213000441 is an apocalyptic number.

It is an amenable number.

21213000441 is a deficient number, since it is larger than the sum of its proper divisors (11781385479).

21213000441 is a wasteful number, since it uses less digits than its factorization.

21213000441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209762 (or 209756 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21213000441 its reverse (14400031212), we get a palindrome (35613031653).

The spelling of 21213000441 in words is "twenty-one billion, two hundred thirteen million, four hundred forty-one", and thus it is an aban number.