211212032220 has 96 divisors (see below), whose sum is σ = 750976128000. Its totient is φ = 48277035072.

The previous prime is 211212032219. The next prime is 211212032249. The reversal of 211212032220 is 22230212112.

It is a super-2 number, since 2×211212032220² (a number of 23 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 211212032193 and 211212032202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27934320 + ... + 27941879.

It is an arithmetic number, because the mean of its divisors is an integer number (7822668000).

Almost surely, 2^211212032220 is an apocalyptic number.

211212032220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212032220 is an abundant number, since it is smaller than the sum of its proper divisors (539764095780).

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

211212032220 is a wasteful number, since it uses less digits than its factorization.

211212032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55876224 (or 55876216 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 211212032220 its reverse (22230212112), we get a palindrome (233442244332).

The spelling of 211212032220 in words is "two hundred eleven billion, two hundred twelve million, thirty-two thousand, two hundred twenty".