211221211220010 has 96 divisors (see below), whose sum is σ = 578951976425472. Its totient is φ = 53348940069120.

The previous prime is 211221211219969. The next prime is 211221211220023. The reversal of 211221211220010 is 10022112122112.

211221211220010 is a `hidden beast` number, since 2 + 1 + 1 + 221 + 211 + 220 + 0 + 10 = 666.

It is a super-2 number, since 2×211221211220010² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 47 ways as a sum of consecutive naturals, for example, 805257459 + ... + 805519718.

It is an arithmetic number, because the mean of its divisors is an integer number (6030749754432).

Almost surely, 2^{211221211220010} is an apocalyptic number.

211221211220010 is an abundant number, since it is smaller than the sum of its proper divisors (367730765205462).

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

211221211220010 is a wasteful number, since it uses less digits than its factorization.

211221211220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610777268 (or 1610777265 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211221211220010 its reverse (10022112122112), we get a palindrome (221243323342122).

The spelling of 211221211220010 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, ten".