21232030554 has 60 divisors (see below), whose sum is σ = 55342921194. Its totient is φ = 6066292176.

The previous prime is 21232030543. The next prime is 21232030559. The reversal of 21232030554 is 45503023212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19122741225 + 2109289329 = 138285^2 + 45927^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21232030559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1329429 + ... + 1345304.

Almost surely, 2^21232030554 is an apocalyptic number.

21232030554 is an abundant number, since it is smaller than the sum of its proper divisors (34110890640).

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

21232030554 is a wasteful number, since it uses less digits than its factorization.

21232030554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674761 (or 2674745 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21232030554 its reverse (45503023212), we get a palindrome (66735053766).

The spelling of 21232030554 in words is "twenty-one billion, two hundred thirty-two million, thirty thousand, five hundred fifty-four".