21503165630 has 64 divisors (see below), whose sum is σ = 40953081600. Its totient is φ = 8117491200.

The previous prime is 21503165623. The next prime is 21503165633. The reversal of 21503165630 is 3656130512.

It is a super-2 number, since 2×21503165630² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503165633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2309264 + ... + 2318556.

It is an arithmetic number, because the mean of its divisors is an integer number (639891900).

Almost surely, 2^21503165630 is an apocalyptic number.

21503165630 is a deficient number, since it is larger than the sum of its proper divisors (19449915970).

21503165630 is a wasteful number, since it uses less digits than its factorization.

21503165630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9509.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 21503165630 in words is "twenty-one billion, five hundred three million, one hundred sixty-five thousand, six hundred thirty".