21421432104 has 16 divisors (see below), whose sum is σ = 53553580320. Its totient is φ = 7140477360.

The previous prime is 21421432103. The next prime is 21421432129. The reversal of 21421432104 is 40123412412.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 892559671 = 21421432104 / (2 + 1 + 4 + 2 + 1 + 4 + 3 + 2 + 1 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (21421432103) 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 3 ways as a sum of consecutive naturals, for example, 446279812 + ... + 446279859.

It is an arithmetic number, because the mean of its divisors is an integer number (3347098770).

Almost surely, 2^21421432104 is an apocalyptic number.

21421432104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21421432104 is an abundant number, since it is smaller than the sum of its proper divisors (32132148216).

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

21421432104 is a wasteful number, since it uses less digits than its factorization.

21421432104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892559680 (or 892559676 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21421432104 its reverse (40123412412), we get a palindrome (61544844516).

The spelling of 21421432104 in words is "twenty-one billion, four hundred twenty-one million, four hundred thirty-two thousand, one hundred four".