21051450204 has 48 divisors (see below), whose sum is σ = 50917749120. Its totient is φ = 6761325760.

The previous prime is 21051450191. The next prime is 21051450253. The reversal of 21051450204 is 40205415012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109267 + ... + 232469.

It is an arithmetic number, because the mean of its divisors is an integer number (1060786440).

Almost surely, 2^21051450204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051450204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25458874560).

21051450204 is an abundant number, since it is smaller than the sum of its proper divisors (29866298916).

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

21051450204 is a wasteful number, since it uses less digits than its factorization.

21051450204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123730 (or 123728 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21051450204 its reverse (40205415012), we get a palindrome (61256865216).

The spelling of 21051450204 in words is "twenty-one billion, fifty-one million, four hundred fifty thousand, two hundred four".