212106157 has 8 divisors (see below), whose sum is σ = 213676056. Its totient is φ = 210541632.

The previous prime is 212106151. The next prime is 212106197. The reversal of 212106157 is 751601212.

It can be written as a sum of positive squares in 4 ways, for example, as 60668521 + 151437636 = 7789^2 + 12306^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212106157 - 2¹⁹ = 211581869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212106151) 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, 108763 + ... + 110695.

It is an arithmetic number, because the mean of its divisors is an integer number (26709507).

Almost surely, 2^212106157 is an apocalyptic number.

It is an amenable number.

212106157 is a deficient number, since it is larger than the sum of its proper divisors (1569899).

212106157 is a wasteful number, since it uses less digits than its factorization.

212106157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 212106157 is about 14563.8647686663. The cubic root of 212106157 is about 596.3727052259.

Adding to 212106157 its reverse (751601212), we get a palindrome (963707369).

The spelling of 212106157 in words is "two hundred twelve million, one hundred six thousand, one hundred fifty-seven".