21213105201 has 32 divisors (see below), whose sum is σ = 31879680000. Its totient is φ = 13938906384.

The previous prime is 21213105181. The next prime is 21213105239. The reversal of 21213105201 is 10250131212.

21213105201 is a `hidden beast` number, since 2 + 12 + 131 + 0 + 520 + 1 = 666.

It is not a de Polignac number, because 21213105201 - 2¹⁴ = 21213088817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213105271) 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, 1269366 + ... + 1285968.

It is an arithmetic number, because the mean of its divisors is an integer number (996240000).

Almost surely, 2^21213105201 is an apocalyptic number.

It is an amenable number.

21213105201 is a deficient number, since it is larger than the sum of its proper divisors (10666574799).

21213105201 is a wasteful number, since it uses less digits than its factorization.

21213105201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17290 (or 17284 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21213105201 its reverse (10250131212), we get a palindrome (31463236413).

The spelling of 21213105201 in words is "twenty-one billion, two hundred thirteen million, one hundred five thousand, two hundred one".