211420390 has 32 divisors (see below), whose sum is σ = 387828000. Its totient is φ = 82967808.

The previous prime is 211420373. The next prime is 211420399. The reversal of 211420390 is 93024112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211420399) 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, 122856 + ... + 124564.

It is an arithmetic number, because the mean of its divisors is an integer number (12119625).

Almost surely, 2^211420390 is an apocalyptic number.

211420390 is a deficient number, since it is larger than the sum of its proper divisors (176407610).

211420390 is a wasteful number, since it uses less digits than its factorization.

211420390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 211420390 is about 14540.3022664592. The cubic root of 211420390 is about 595.7292942814.

The spelling of 211420390 in words is "two hundred eleven million, four hundred twenty thousand, three hundred ninety".