21201121232 has 20 divisors (see below), whose sum is σ = 41191604640. Its totient is φ = 10571029728.

The previous prime is 21201121231. The next prime is 21201121241. The reversal of 21201121232 is 23212110212.

It is a super-2 number, since 2×21201121232² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21201121232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839758 + ... + 1851245.

It is an arithmetic number, because the mean of its divisors is an integer number (2059580232).

Almost surely, 2^21201121232 is an apocalyptic number.

It is an amenable number.

21201121232 is a deficient number, since it is larger than the sum of its proper divisors (19990483408).

21201121232 is a wasteful number, since it uses less digits than its factorization.

21201121232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691370 (or 3691364 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21201121232 its reverse (23212110212), we get a palindrome (44413231444).

The spelling of 21201121232 in words is "twenty-one billion, two hundred one million, one hundred twenty-one thousand, two hundred thirty-two".