21451430628 has 36 divisors (see below), whose sum is σ = 54481456848. Its totient is φ = 7116585840.

The previous prime is 21451430573. The next prime is 21451430629. The reversal of 21451430628 is 82603415412.

It is a happy number.

21451430628 is a `hidden beast` number, since 2 + 14 + 5 + 14 + 3 + 0 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21451430592 and 21451430601.

It is not an unprimeable number, because it can be changed into a prime (21451430629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1404426 + ... + 1419617.

Almost surely, 2^21451430628 is an apocalyptic number.

It is an amenable number.

21451430628 is an abundant number, since it is smaller than the sum of its proper divisors (33030026220).

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

21451430628 is a wasteful number, since it uses less digits than its factorization.

21451430628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824264 (or 2824259 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 21451430628 in words is "twenty-one billion, four hundred fifty-one million, four hundred thirty thousand, six hundred twenty-eight".