211221004434 has 32 divisors (see below), whose sum is σ = 461113853760. Its totient is φ = 63969139200.

The previous prime is 211221004417. The next prime is 211221004471. The reversal of 211221004434 is 434400122112.

It is a super-2 number, since 2×211221004434² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816199 + ... + 1043370.

It is an arithmetic number, because the mean of its divisors is an integer number (14409807930).

Almost surely, 2^211221004434 is an apocalyptic number.

211221004434 is an abundant number, since it is smaller than the sum of its proper divisors (249892849326).

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

211221004434 is a wasteful number, since it uses less digits than its factorization.

211221004434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861306.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 211221004434 its reverse (434400122112), we get a palindrome (645621126546).

The spelling of 211221004434 in words is "two hundred eleven billion, two hundred twenty-one million, four thousand, four hundred thirty-four".