21420625630 has 8 divisors (see below), whose sum is σ = 38557126152. Its totient is φ = 8568250248.

The previous prime is 21420625607. The next prime is 21420625649. The reversal of 21420625630 is 3652602412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21420625630³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21420625592 and 21420625601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071031272 + ... + 1071031291.

It is an arithmetic number, because the mean of its divisors is an integer number (4819640769).

Almost surely, 2^21420625630 is an apocalyptic number.

21420625630 is a deficient number, since it is larger than the sum of its proper divisors (17136500522).

21420625630 is a wasteful number, since it uses less digits than its factorization.

21420625630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142062570.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 21420625630 in words is "twenty-one billion, four hundred twenty million, six hundred twenty-five thousand, six hundred thirty".