21001201232 has 40 divisors (see below), whose sum is σ = 44654766912. Its totient is φ = 9488825600.

The previous prime is 21001201231. The next prime is 21001201279. The reversal of 21001201232 is 23210210012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001201231) 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, 327869 + ... + 386652.

Almost surely, 2^21001201232 is an apocalyptic number.

21001201232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001201232 is an abundant number, since it is smaller than the sum of its proper divisors (23653565680).

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

21001201232 is a wasteful number, since it uses less digits than its factorization.

21001201232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714707 (or 714701 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001201232 its reverse (23210210012), we get a palindrome (44211411244).

The spelling of 21001201232 in words is "twenty-one billion, one million, two hundred one thousand, two hundred thirty-two".