211755420434 has 16 divisors (see below), whose sum is σ = 347166383616. Its totient is φ = 96435105600.

The previous prime is 211755420397. The next prime is 211755420439. The reversal of 211755420434 is 434024557112.

It is not an unprimeable number, because it can be changed into a prime (211755420439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100452182 + ... + 100454289.

It is an arithmetic number, because the mean of its divisors is an integer number (21697898976).

Almost surely, 2^211755420434 is an apocalyptic number.

211755420434 is a deficient number, since it is larger than the sum of its proper divisors (135410963182).

211755420434 is a wasteful number, since it uses less digits than its factorization.

211755420434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200906521.

The product of its (nonzero) digits is 134400, while the sum is 38.

Adding to 211755420434 its reverse (434024557112), we get a palindrome (645779977546).

The spelling of 211755420434 in words is "two hundred eleven billion, seven hundred fifty-five million, four hundred twenty thousand, four hundred thirty-four".