21212213301 has 48 divisors (see below), whose sum is σ = 34728782400. Its totient is φ = 12395303424.

The previous prime is 21212213293. The next prime is 21212213303. The reversal of 21212213301 is 10331221212.

21212213301 is a `hidden beast` number, since 212 + 122 + 1 + 330 + 1 = 666.

It is not a de Polignac number, because 21212213301 - 2³ = 21212213293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212213303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109675 + ... + 233351.

It is an arithmetic number, because the mean of its divisors is an integer number (723516300).

Almost surely, 2^21212213301 is an apocalyptic number.

It is an amenable number.

21212213301 is a deficient number, since it is larger than the sum of its proper divisors (13516569099).

21212213301 is a wasteful number, since it uses less digits than its factorization.

21212213301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123778 (or 123775 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21212213301 its reverse (10331221212), we get a palindrome (31543434513).

The spelling of 21212213301 in words is "twenty-one billion, two hundred twelve million, two hundred thirteen thousand, three hundred one".