21232124554 has 32 divisors (see below), whose sum is σ = 33456764880. Its totient is φ = 10092300288.

The previous prime is 21232124531. The next prime is 21232124561. The reversal of 21232124554 is 45542123212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10665312529 + 10566812025 = 103273^2 + 102795^2 .

It is a super-2 number, since 2×21232124554² (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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098744 + ... + 1117900.

Almost surely, 2^21232124554 is an apocalyptic number.

21232124554 is a deficient number, since it is larger than the sum of its proper divisors (12224640326).

21232124554 is a wasteful number, since it uses less digits than its factorization.

21232124554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19482.

The product of its digits is 19200, while the sum is 31.

Adding to 21232124554 its reverse (45542123212), we get a palindrome (66774247766).

The spelling of 21232124554 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-four thousand, five hundred fifty-four".