212235814840 has 96 divisors (see below), whose sum is σ = 556434560880. Its totient is φ = 72643458048.

The previous prime is 212235814793. The next prime is 212235814873. The reversal of 212235814840 is 48418532212.

It is a happy number.

It is a super-2 number, since 2×212235814840² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 212235814793 and 212235814802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1070979 + ... + 1253581.

Almost surely, 2^212235814840 is an apocalyptic number.

212235814840 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 212235814840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278217280440).

212235814840 is an abundant number, since it is smaller than the sum of its proper divisors (344198746040).

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

212235814840 is a wasteful number, since it uses less digits than its factorization.

212235814840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183221 (or 183210 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 212235814840 in words is "two hundred twelve billion, two hundred thirty-five million, eight hundred fourteen thousand, eight hundred forty".