21461230442 has 8 divisors (see below), whose sum is σ = 32196150756. Its totient is φ = 10729180192.

The previous prime is 21461230411. The next prime is 21461230447. The reversal of 21461230442 is 24403216412.

It can be written as a sum of positive squares in 2 ways, for example, as 19779328321 + 1681902121 = 140639^2 + 41011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21461230447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698723 + ... + 728790.

Almost surely, 2^21461230442 is an apocalyptic number.

21461230442 is a deficient number, since it is larger than the sum of its proper divisors (10734920314).

21461230442 is a wasteful number, since it uses less digits than its factorization.

21461230442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435032.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21461230442 its reverse (24403216412), we get a palindrome (45864446854).

The spelling of 21461230442 in words is "twenty-one billion, four hundred sixty-one million, two hundred thirty thousand, four hundred forty-two".