21211430234 has 4 divisors (see below), whose sum is σ = 31817145354. Its totient is φ = 10605715116.

The previous prime is 21211430209. The next prime is 21211430267. The reversal of 21211430234 is 43203411212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12034748209 + 9176682025 = 109703^2 + 95795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302857557 + ... + 5302857560.

Almost surely, 2^21211430234 is an apocalyptic number.

21211430234 is a deficient number, since it is larger than the sum of its proper divisors (10605715120).

21211430234 is a wasteful number, since it uses less digits than its factorization.

21211430234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605715119.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21211430234 its reverse (43203411212), we get a palindrome (64414841446).

The spelling of 21211430234 in words is "twenty-one billion, two hundred eleven million, four hundred thirty thousand, two hundred thirty-four".