211402434 has 16 divisors (see below), whose sum is σ = 426547872. Its totient is φ = 69843648.

The previous prime is 211402421. The next prime is 211402447. The reversal of 211402434 is 434204112.

It is an interprime number because it is at equal distance from previous prime (211402421) and next prime (211402447).

It is a super-2 number, since 2×211402434² = 89381978202248712, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211402434.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155224 + ... + 156579.

It is an arithmetic number, because the mean of its divisors is an integer number (26659242).

Almost surely, 2^211402434 is an apocalyptic number.

211402434 is an abundant number, since it is smaller than the sum of its proper divisors (215145438).

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

211402434 is a wasteful number, since it uses less digits than its factorization.

211402434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311921.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 211402434 is about 14539.6847971337. The cubic root of 211402434 is about 595.7124286453.

Adding to 211402434 its reverse (434204112), we get a palindrome (645606546).

The spelling of 211402434 in words is "two hundred eleven million, four hundred two thousand, four hundred thirty-four".