211121210211220 has 48 divisors (see below), whose sum is σ = 445904142566400. Its totient is φ = 83963948257280.

The previous prime is 211121210211143. The next prime is 211121210211313. The reversal of 211121210211220 is 22112012121112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31388140 + ... + 37516099.

It is an arithmetic number, because the mean of its divisors is an integer number (9289669636800).

Almost surely, 2^{211121210211220} is an apocalyptic number.

211121210211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121210211220 is an abundant number, since it is smaller than the sum of its proper divisors (234782932355180).

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

211121210211220 is a wasteful number, since it uses less digits than its factorization.

211121210211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68905128 (or 68905126 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211121210211220 its reverse (22112012121112), we get a palindrome (233233222332332).

The spelling of 211121210211220 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, two hundred twenty".