21420446204 has 24 divisors (see below), whose sum is σ = 40464416160. Its totient is φ = 9891299264.

The previous prime is 21420446197. The next prime is 21420446207. The reversal of 21420446204 is 40264402412.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420446207) 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, 4011659 + ... + 4016994.

It is an arithmetic number, because the mean of its divisors is an integer number (1686017340).

Almost surely, 2^21420446204 is an apocalyptic number.

It is an amenable number.

21420446204 is a deficient number, since it is larger than the sum of its proper divisors (19043969956).

21420446204 is a wasteful number, since it uses less digits than its factorization.

21420446204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8028709 (or 8028707 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21420446204 its reverse (40264402412), we get a palindrome (61684848616).

The spelling of 21420446204 in words is "twenty-one billion, four hundred twenty million, four hundred forty-six thousand, two hundred four".