212102122340 has 24 divisors (see below), whose sum is σ = 445854197880. Its totient is φ = 84757088768.

The previous prime is 212102122333. The next prime is 212102122369. The reversal of 212102122340 is 43221201212.

It can be written as a sum of positive squares in 4 ways, for example, as 9150070336 + 202952052004 = 95656^2 + 450502^2 .

It is a super-2 number, since 2×212102122340² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5214245 + ... + 5254764.

It is an arithmetic number, because the mean of its divisors is an integer number (18577258245).

Almost surely, 2^212102122340 is an apocalyptic number.

212102122340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212102122340 is an abundant number, since it is smaller than the sum of its proper divisors (233752075540).

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

212102122340 is a wasteful number, since it uses less digits than its factorization.

212102122340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470031 (or 10470029 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 212102122340 its reverse (43221201212), we get a palindrome (255323323552).

The spelling of 212102122340 in words is "two hundred twelve billion, one hundred two million, one hundred twenty-two thousand, three hundred forty".