212211311240 has 32 divisors (see below), whose sum is σ = 489121196760. Its totient is φ = 82814169600.

The previous prime is 212211311237. The next prime is 212211311243. The reversal of 212211311240 is 42113112212.

It is an interprime number because it is at equal distance from previous prime (212211311237) and next prime (212211311243).

It can be written as a sum of positive squares in 4 ways, for example, as 171941256964 + 40270054276 = 414658^2 + 200674^2 .

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

It is not an unprimeable number, because it can be changed into a prime (212211311243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64696931 + ... + 64700210.

Almost surely, 2^212211311240 is an apocalyptic number.

212211311240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212211311240 is an abundant number, since it is smaller than the sum of its proper divisors (276909885520).

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

212211311240 is a wasteful number, since it uses less digits than its factorization.

212211311240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129397193 (or 129397189 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 212211311240 its reverse (42113112212), we get a palindrome (254324423452).

The spelling of 212211311240 in words is "two hundred twelve billion, two hundred eleven million, three hundred eleven thousand, two hundred forty".