212123011 has 4 divisors (see below), whose sum is σ = 223287400. Its totient is φ = 200958624.

The previous prime is 212123003. The next prime is 212123029. The reversal of 212123011 is 110321212.

212123011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212123011 - 2³ = 212123003 is a prime.

It is a super-2 number, since 2×212123011² = 89992343591412242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122982 and 212123000.

It is not an unprimeable number, because it can be changed into a prime (212123071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5582166 + ... + 5582203.

It is an arithmetic number, because the mean of its divisors is an integer number (55821850).

Almost surely, 2^212123011 is an apocalyptic number.

212123011 is a deficient number, since it is larger than the sum of its proper divisors (11164389).

212123011 is a wasteful number, since it uses less digits than its factorization.

212123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11164388.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212123011 is about 14564.4433810565. The cubic root of 212123011 is about 596.3885007746.

Adding to 212123011 its reverse (110321212), we get a palindrome (322444223).

The spelling of 212123011 in words is "two hundred twelve million, one hundred twenty-three thousand, eleven".