212021144340 has 96 divisors (see below), whose sum is σ = 630628758144. Its totient is φ = 53039738880.

The previous prime is 212021144327. The next prime is 212021144353. The reversal of 212021144340 is 43441120212.

It is an interprime number because it is at equal distance from previous prime (212021144327) and next prime (212021144353).

It is a super-2 number, since 2×212021144340² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212021144340.

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, 25401 + ... + 651680.

It is an arithmetic number, because the mean of its divisors is an integer number (6569049564).

Almost surely, 2^212021144340 is an apocalyptic number.

212021144340 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 212021144340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315314379072).

212021144340 is an abundant number, since it is smaller than the sum of its proper divisors (418607613804).

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

212021144340 is a wasteful number, since it uses less digits than its factorization.

212021144340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677417 (or 677415 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 212021144340 its reverse (43441120212), we get a palindrome (255462264552).

The spelling of 212021144340 in words is "two hundred twelve billion, twenty-one million, one hundred forty-four thousand, three hundred forty".