21421204000 has 96 divisors (see below), whose sum is σ = 60150819456. Its totient is φ = 7344403200.

The previous prime is 21421203997. The next prime is 21421204009. The reversal of 21421204000 is 40212412.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21421204009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354522 + ... + 410521.

It is an arithmetic number, because the mean of its divisors is an integer number (626571036).

Almost surely, 2^21421204000 is an apocalyptic number.

21421204000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421204000 is an abundant number, since it is smaller than the sum of its proper divisors (38729615456).

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

21421204000 is an equidigital number, since it uses as much as digits as its factorization.

21421204000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765075 (or 765057 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21421204000 its reverse (40212412), we get a palindrome (21461416412).

The spelling of 21421204000 in words is "twenty-one billion, four hundred twenty-one million, two hundred four thousand".