21212011001211 has 8 divisors (see below), whose sum is σ = 28430758201344. Its totient is φ = 14067302234280.

The previous prime is 21212011001201. The next prime is 21212011001213. The reversal of 21212011001211 is 11210011021212.

It is a happy number.

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

It is not a de Polignac number, because 21212011001211 - 2²¹ = 21212008904059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212011001213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18509607631 + ... + 18509608776.

It is an arithmetic number, because the mean of its divisors is an integer number (3553844775168).

Almost surely, 2^{21212011001211} is an apocalyptic number.

21212011001211 is a deficient number, since it is larger than the sum of its proper divisors (7218747200133).

21212011001211 is a wasteful number, since it uses less digits than its factorization.

21212011001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37019216601.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212011001211 its reverse (11210011021212), we get a palindrome (32422022022423).

The spelling of 21212011001211 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one thousand, two hundred eleven".