21425211404 has 24 divisors (see below), whose sum is σ = 37947678720. Its totient is φ = 10583724816.

The previous prime is 21425211389. The next prime is 21425211407. The reversal of 21425211404 is 40411252412.

It is not an unprimeable number, because it can be changed into a prime (21425211407) 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, 33179 + ... + 209645.

It is an arithmetic number, because the mean of its divisors is an integer number (1581153280).

Almost surely, 2^21425211404 is an apocalyptic number.

It is an amenable number.

21425211404 is a deficient number, since it is larger than the sum of its proper divisors (16522467316).

21425211404 is a wasteful number, since it uses less digits than its factorization.

21425211404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176837 (or 176835 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21425211404 its reverse (40411252412), we get a palindrome (61836463816).

The spelling of 21425211404 in words is "twenty-one billion, four hundred twenty-five million, two hundred eleven thousand, four hundred four".