211321057 has 16 divisors (see below), whose sum is σ = 223269840. Its totient is φ = 199729152.

The previous prime is 211321051. The next prime is 211321069. The reversal of 211321057 is 750123112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 74805201 + 136515856 = 8649^2 + 11684^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321057 - 2¹⁹ = 210796769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211321051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365953 + ... + 366529.

It is an arithmetic number, because the mean of its divisors is an integer number (13954365).

Almost surely, 2^211321057 is an apocalyptic number.

It is an amenable number.

211321057 is a deficient number, since it is larger than the sum of its proper divisors (11948783).

211321057 is a wasteful number, since it uses less digits than its factorization.

211321057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 211321057 is about 14536.8860833399. The cubic root of 211321057 is about 595.6359812255.

Adding to 211321057 its reverse (750123112), we get a palindrome (961444169).

The spelling of 211321057 in words is "two hundred eleven million, three hundred twenty-one thousand, fifty-seven".