212890138440 has 128 divisors (see below), whose sum is σ = 772844924160. Its totient is φ = 45798211584.

The previous prime is 212890138421. The next prime is 212890138469. The reversal of 212890138440 is 44831098212.

212890138440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212890138440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 212890138392 and 212890138401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7439857 + ... + 7468416.

It is an arithmetic number, because the mean of its divisors is an integer number (6037850970).

Almost surely, 2^212890138440 is an apocalyptic number.

212890138440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212890138440 is an abundant number, since it is smaller than the sum of its proper divisors (559954785720).

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

212890138440 is a wasteful number, since it uses less digits than its factorization.

212890138440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14908311 (or 14908307 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 212890138440 in words is "two hundred twelve billion, eight hundred ninety million, one hundred thirty-eight thousand, four hundred forty".