211221001010 has 64 divisors (see below), whose sum is σ = 406108684800. Its totient is φ = 78863818752.

The previous prime is 211221001001. The next prime is 211221001031. The reversal of 211221001010 is 10100122112.

It is a super-2 number, since 2×211221001010² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221000982 and 211221001000.

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, 14403602 + ... + 14418258.

It is an arithmetic number, because the mean of its divisors is an integer number (6345448200).

Almost surely, 2^211221001010 is an apocalyptic number.

211221001010 is a deficient number, since it is larger than the sum of its proper divisors (194887683790).

211221001010 is a wasteful number, since it uses less digits than its factorization.

211221001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15795.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211221001010 its reverse (10100122112), we get a palindrome (221321123122).

The spelling of 211221001010 in words is "two hundred eleven billion, two hundred twenty-one million, one thousand, ten".