212155542 has 48 divisors (see below), whose sum is σ = 482347008. Its totient is φ = 67264560.

The previous prime is 212155523. The next prime is 212155571. The reversal of 212155542 is 245551212.

212155542 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77733 + ... + 80415.

It is an arithmetic number, because the mean of its divisors is an integer number (10048896).

Almost surely, 2^212155542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212155542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241173504).

212155542 is an abundant number, since it is smaller than the sum of its proper divisors (270191466).

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

212155542 is a wasteful number, since it uses less digits than its factorization.

212155542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905 (or 2902 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 212155542 is about 14565.5601334106. The cubic root of 212155542 is about 596.4189864230.

The spelling of 212155542 in words is "two hundred twelve million, one hundred fifty-five thousand, five hundred forty-two".