212277523542 has 96 divisors (see below), whose sum is σ = 519014909952. Its totient is φ = 57639024576.

The previous prime is 212277523511. The next prime is 212277523553. The reversal of 212277523542 is 245325772212.

It is a super-2 number, since 2×212277523542² (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 = 212277523494 and 212277523503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 240843 + ... + 694665.

It is an arithmetic number, because the mean of its divisors is an integer number (5406405312).

Almost surely, 2^212277523542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212277523542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259507454976).

212277523542 is an abundant number, since it is smaller than the sum of its proper divisors (306737386410).

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

212277523542 is a wasteful number, since it uses less digits than its factorization.

212277523542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453922 (or 453915 counting only the distinct ones).

The product of its digits is 470400, while the sum is 42.

The spelling of 212277523542 in words is "two hundred twelve billion, two hundred seventy-seven million, five hundred twenty-three thousand, five hundred forty-two".