21210012212011 has 32 divisors (see below), whose sum is σ = 24522637579776. Its totient is φ = 17968695360000.

The previous prime is 21210012211991. The next prime is 21210012212027. The reversal of 21210012212011 is 11021221001212.

It is not a de Polignac number, because 21210012212011 - 2¹¹ = 21210012209963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210012212071) 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, 1128002736 + ... + 1128021538.

It is an arithmetic number, because the mean of its divisors is an integer number (766332424368).

Almost surely, 2^{21210012212011} is an apocalyptic number.

21210012212011 is a deficient number, since it is larger than the sum of its proper divisors (3312625367765).

21210012212011 is a wasteful number, since it uses less digits than its factorization.

21210012212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21603.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210012212011 its reverse (11021221001212), we get a palindrome (32231233213223).

The spelling of 21210012212011 in words is "twenty-one trillion, two hundred ten billion, twelve million, two hundred twelve thousand, eleven".