211231421340 has 48 divisors (see below), whose sum is σ = 598934676480. Its totient is φ = 55615360320.

The previous prime is 211231421333. The next prime is 211231421369. The reversal of 211231421340 is 43124132112.

It is a super-2 number, since 2×211231421340² (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 211231421340.

It is a congruent number.

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, 22277056 + ... + 22286535.

It is an arithmetic number, because the mean of its divisors is an integer number (12477805760).

Almost surely, 2^211231421340 is an apocalyptic number.

211231421340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231421340 is an abundant number, since it is smaller than the sum of its proper divisors (387703255140).

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

211231421340 is a wasteful number, since it uses less digits than its factorization.

211231421340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44563682 (or 44563680 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 211231421340 its reverse (43124132112), we get a palindrome (254355553452).

The spelling of 211231421340 in words is "two hundred eleven billion, two hundred thirty-one million, four hundred twenty-one thousand, three hundred forty".