221421203615630 has 16 divisors (see below), whose sum is σ = 398558344215024. Its totient is φ = 88568441955840.

The previous prime is 221421203615629. The next prime is 221421203615713. The reversal of 221421203615630 is 36516302124122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31232765 + ... + 37660695.

It is an arithmetic number, because the mean of its divisors is an integer number (24909896513439).

Almost surely, 2^{221421203615630} is an apocalyptic number.

221421203615630 is a deficient number, since it is larger than the sum of its proper divisors (177137140599394).

221421203615630 is a wasteful number, since it uses less digits than its factorization.

221421203615630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9872611.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 221421203615630 its reverse (36516302124122), we get a palindrome (257937505739752).

The spelling of 221421203615630 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, six hundred fifteen thousand, six hundred thirty".