211020128 has 36 divisors (see below), whose sum is σ = 456655500. Its totient is φ = 95916480.

The previous prime is 211020127. The next prime is 211020143. The reversal of 211020128 is 821020112.

It is a happy number.

It is a super-2 number, since 2×211020128² = 89058988842272768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020127) 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 5 ways as a sum of consecutive naturals, for example, 23378 + ... + 31121.

It is an arithmetic number, because the mean of its divisors is an integer number (12684875).

Almost surely, 2^211020128 is an apocalyptic number.

It is an amenable number.

211020128 is an abundant number, since it is smaller than the sum of its proper divisors (245635372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211020128 is a wasteful number, since it uses less digits than its factorization.

211020128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54531 (or 54512 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 211020128 is about 14526.5318641443. The cubic root of 211020128 is about 595.3531110223.

The spelling of 211020128 in words is "two hundred eleven million, twenty thousand, one hundred twenty-eight".