211221221021210 has 96 divisors (see below), whose sum is σ = 410387265348480. Its totient is φ = 78239840836608.

The previous prime is 211221221021207. The next prime is 211221221021299. The reversal of 211221221021210 is 12120122122112.

It is a super-2 number, since 2×211221221021210² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164526971 + ... + 165805809.

It is an arithmetic number, because the mean of its divisors is an integer number (4274867347380).

Almost surely, 2^{211221221021210} is an apocalyptic number.

211221221021210 is a deficient number, since it is larger than the sum of its proper divisors (199166044327270).

211221221021210 is a wasteful number, since it uses less digits than its factorization.

211221221021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279800 (or 1279783 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221221021210 its reverse (12120122122112), we get a palindrome (223341343143322).

The spelling of 211221221021210 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, two hundred ten".