21003354630 has 48 divisors (see below), whose sum is σ = 55639087920. Its totient is φ = 5495216064.

The previous prime is 21003354571. The next prime is 21003354677. The reversal of 21003354630 is 3645330012.

It is a happy number.

21003354630 is a `hidden beast` number, since 21 + 0 + 0 + 3 + 3 + 5 + 4 + 630 = 666.

It is a super-2 number, since 2×21003354630² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003354594 and 21003354603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2196840 + ... + 2206379.

It is an arithmetic number, because the mean of its divisors is an integer number (1159147665).

Almost surely, 2^21003354630 is an apocalyptic number.

21003354630 is an abundant number, since it is smaller than the sum of its proper divisors (34635733290).

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

21003354630 is a wasteful number, since it uses less digits than its factorization.

21003354630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403285 (or 4403282 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21003354630 its reverse (3645330012), we get a palindrome (24648684642).

The spelling of 21003354630 in words is "twenty-one billion, three million, three hundred fifty-four thousand, six hundred thirty".