211223101020 has 384 divisors, whose sum is σ = 647507976192. Its totient is φ = 51325747200.

The previous prime is 211223101013. The next prime is 211223101031. The reversal of 211223101020 is 20101322112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 405418360 + ... + 405418880.

It is an arithmetic number, because the mean of its divisors is an integer number (1686218688).

Almost surely, 2^211223101020 is an apocalyptic number.

211223101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211223101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323753988096).

211223101020 is an abundant number, since it is smaller than the sum of its proper divisors (436284875172).

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

211223101020 is a wasteful number, since it uses less digits than its factorization.

211223101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 211223101020 its reverse (20101322112), we get a palindrome (231324423132).

The spelling of 211223101020 in words is "two hundred eleven billion, two hundred twenty-three million, one hundred one thousand, twenty".