211505434 has 16 divisors (see below), whose sum is σ = 364183488. Its totient is φ = 90244512.

The previous prime is 211505423. The next prime is 211505443. The reversal of 211505434 is 434505112.

It is a happy number.

It is a super-2 number, since 2×211505434² = 89469097223056712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211505399 and 211505408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30099 + ... + 36454.

It is an arithmetic number, because the mean of its divisors is an integer number (22761468).

Almost surely, 2^211505434 is an apocalyptic number.

211505434 is a deficient number, since it is larger than the sum of its proper divisors (152678054).

211505434 is a wasteful number, since it uses less digits than its factorization.

211505434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66789.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 211505434 is about 14543.2263958174. The cubic root of 211505434 is about 595.8091610822.

The spelling of 211505434 in words is "two hundred eleven million, five hundred five thousand, four hundred thirty-four".