21011153234 has 16 divisors (see below), whose sum is σ = 32220639648. Its totient is φ = 10273229472.

The previous prime is 21011153227. The next prime is 21011153239. The reversal of 21011153234 is 43235111012.

21011153234 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21011153239) 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, 553904 + ... + 590619.

It is an arithmetic number, because the mean of its divisors is an integer number (2013789978).

Almost surely, 2^21011153234 is an apocalyptic number.

21011153234 is a deficient number, since it is larger than the sum of its proper divisors (11209486414).

21011153234 is a wasteful number, since it uses less digits than its factorization.

21011153234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144729.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21011153234 its reverse (43235111012), we get a palindrome (64246264246).

The spelling of 21011153234 in words is "twenty-one billion, eleven million, one hundred fifty-three thousand, two hundred thirty-four".