21211430235 has 32 divisors (see below), whose sum is σ = 36876933120. Its totient is φ = 10371628800.

The previous prime is 21211430209. The next prime is 21211430267. The reversal of 21211430235 is 53203411212.

It is not a de Polignac number, because 21211430235 - 2⁵ = 21211430203 is a prime.

It is a super-2 number, since 2×21211430235² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1191586 + ... + 1209255.

It is an arithmetic number, because the mean of its divisors is an integer number (1152404160).

Almost surely, 2^21211430235 is an apocalyptic number.

21211430235 is a deficient number, since it is larger than the sum of its proper divisors (15665502885).

21211430235 is a wasteful number, since it uses less digits than its factorization.

21211430235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400899.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21211430235 its reverse (53203411212), we get a palindrome (74414841447).

The spelling of 21211430235 in words is "twenty-one billion, two hundred eleven million, four hundred thirty thousand, two hundred thirty-five".