21212302401 has 24 divisors (see below), whose sum is σ = 31300898304. Its totient is φ = 13836674880.

The previous prime is 21212302379. The next prime is 21212302417. The reversal of 21212302401 is 10420321212.

It is a happy number.

21212302401 is a `hidden beast` number, since 21 + 212 + 30 + 2 + 401 = 666.

It is not a de Polignac number, because 21212302401 - 2⁹ = 21212301889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212302481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2483400 + ... + 2491926.

It is an arithmetic number, because the mean of its divisors is an integer number (1304204096).

Almost surely, 2^21212302401 is an apocalyptic number.

It is an amenable number.

21212302401 is a deficient number, since it is larger than the sum of its proper divisors (10088595903).

21212302401 is a wasteful number, since it uses less digits than its factorization.

21212302401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14461 (or 14458 counting only the distinct ones).

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

Adding to 21212302401 its reverse (10420321212), we get a palindrome (31632623613).

The spelling of 21212302401 in words is "twenty-one billion, two hundred twelve million, three hundred two thousand, four hundred one".