21212995 has 8 divisors (see below), whose sum is σ = 25494480. Its totient is φ = 16944480.

The previous prime is 21212993. The next prime is 21213011. The reversal of 21212995 is 59921212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212995 - 2¹ = 21212993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212993) 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 7 ways as a sum of consecutive naturals, for example, 825 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (3186810).

Almost surely, 2^21212995 is an apocalyptic number.

21212995 is a deficient number, since it is larger than the sum of its proper divisors (4281485).

21212995 is an equidigital number, since it uses as much as digits as its factorization.

21212995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6485.

The product of its digits is 3240, while the sum is 31.

The square root of 21212995 is about 4605.7567239271. The cubic root of 21212995 is about 276.8220389847.

The spelling of 21212995 in words is "twenty-one million, two hundred twelve thousand, nine hundred ninety-five".