21221560420630 has 16 divisors (see below), whose sum is σ = 38419611123024. Its totient is φ = 8439556975840.

The previous prime is 21221560420603. The next prime is 21221560420637. The reversal of 21221560420630 is 3602406512212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221560420637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6133397236 + ... + 6133400695.

It is an arithmetic number, because the mean of its divisors is an integer number (2401225695189).

Almost surely, 2^{21221560420630} is an apocalyptic number.

21221560420630 is a deficient number, since it is larger than the sum of its proper divisors (17198050702394).

21221560420630 is a wasteful number, since it uses less digits than its factorization.

21221560420630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12266798111.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21221560420630 its reverse (3602406512212), we get a palindrome (24823966932842).

The spelling of 21221560420630 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred sixty million, four hundred twenty thousand, six hundred thirty".