211223331020 has 48 divisors (see below), whose sum is σ = 477762404448. Its totient is φ = 77978280960.

The previous prime is 211223330993. The next prime is 211223331073. The reversal of 211223331020 is 20133322112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211223330983 and 211223331001.

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, 1751507 + ... + 1868213.

It is an arithmetic number, because the mean of its divisors is an integer number (9953383426).

Almost surely, 2^211223331020 is an apocalyptic number.

211223331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211223331020 is an abundant number, since it is smaller than the sum of its proper divisors (266539073428).

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

211223331020 is a wasteful number, since it uses less digits than its factorization.

211223331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123690 (or 123688 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 211223331020 its reverse (20133322112), we get a palindrome (231356653132).

The spelling of 211223331020 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred thirty-one thousand, twenty".