211542051 has 16 divisors (see below), whose sum is σ = 322773248. Its totient is φ = 120722400.

The previous prime is 211542031. The next prime is 211542113. The reversal of 211542051 is 150245112.

It is not a de Polignac number, because 211542051 - 2¹⁴ = 211525667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (211542031) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10821 + ... + 23241.

It is an arithmetic number, because the mean of its divisors is an integer number (20173328).

Almost surely, 2^211542051 is an apocalyptic number.

211542051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211542051 is a deficient number, since it is larger than the sum of its proper divisors (111231197).

211542051 is a wasteful number, since it uses less digits than its factorization.

211542051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13242.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 211542051 is about 14544.4852435554. The cubic root of 211542051 is about 595.8435423661.

Adding to 211542051 its reverse (150245112), we get a palindrome (361787163).

The spelling of 211542051 in words is "two hundred eleven million, five hundred forty-two thousand, fifty-one".