21012122010 has 64 divisors (see below), whose sum is σ = 55301750784. Its totient is φ = 5067163200.

The previous prime is 21012122003. The next prime is 21012122041. The reversal of 21012122010 is 1022121012.

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, 103654 + ... + 229713.

It is an arithmetic number, because the mean of its divisors is an integer number (864089856).

Almost surely, 2^21012122010 is an apocalyptic number.

21012122010 is an abundant number, since it is smaller than the sum of its proper divisors (34289628774).

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

21012122010 is a wasteful number, since it uses less digits than its factorization.

21012122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333579.

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

Adding to 21012122010 its reverse (1022121012), we get a palindrome (22034243022).

The spelling of 21012122010 in words is "twenty-one billion, twelve million, one hundred twenty-two thousand, ten".