21012212010 has 64 divisors (see below), whose sum is σ = 50631340032. Its totient is φ = 5580860736.

The previous prime is 21012212009. The next prime is 21012212069. The reversal of 21012212010 is 1021221012.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10184239 + ... + 10186301.

It is an arithmetic number, because the mean of its divisors is an integer number (791114688).

Almost surely, 2^21012212010 is an apocalyptic number.

21012212010 is an abundant number, since it is smaller than the sum of its proper divisors (29619128022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012212010 is a wasteful number, since it uses less digits than its factorization.

21012212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012212010 its reverse (1021221012), we get a palindrome (22033433022).

The spelling of 21012212010 in words is "twenty-one billion, twelve million, two hundred twelve thousand, ten".