211221123031110 has 32 divisors (see below), whose sum is σ = 506971240899840. Its totient is φ = 56321127738848.

The previous prime is 211221123031103. The next prime is 211221123031147. The reversal of 211221123031110 is 11130321122112.

It is a super-2 number, since 2×211221123031110² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281185500 + ... + 281935679.

It is an arithmetic number, because the mean of its divisors is an integer number (15842851278120).

Almost surely, 2^{211221123031110} is an apocalyptic number.

211221123031110 is an abundant number, since it is smaller than the sum of its proper divisors (295750117868730).

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

211221123031110 is a wasteful number, since it uses less digits than its factorization.

211221123031110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563133692.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 211221123031110 its reverse (11130321122112), we get a palindrome (222351444153222).

The spelling of 211221123031110 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-three million, thirty-one thousand, one hundred ten".