21630380534 has 8 divisors (see below), whose sum is σ = 37080652368. Its totient is φ = 9270163080.

The previous prime is 21630380533. The next prime is 21630380549. The reversal of 21630380534 is 43508303612.

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

It is a super-2 number, since 2×21630380534² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21630380494 and 21630380503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630380531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772513577 + ... + 772513604.

It is an arithmetic number, because the mean of its divisors is an integer number (4635081546).

Almost surely, 2^21630380534 is an apocalyptic number.

21630380534 is a deficient number, since it is larger than the sum of its proper divisors (15450271834).

21630380534 is a wasteful number, since it uses less digits than its factorization.

21630380534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545027190.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21630380534 in words is "twenty-one billion, six hundred thirty million, three hundred eighty thousand, five hundred thirty-four".