221421651552 has 36 divisors (see below), whose sum is σ = 629667822420. Its totient is φ = 73807217088.

The previous prime is 221421651509. The next prime is 221421651569. The reversal of 221421651552 is 255156124122.

221421651552 is a `hidden beast` number, since 2 + 2 + 1 + 42 + 1 + 65 + 1 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384412302 + ... + 384412877.

It is an arithmetic number, because the mean of its divisors is an integer number (17490772845).

Almost surely, 2^221421651552 is an apocalyptic number.

It is an amenable number.

221421651552 is an abundant number, since it is smaller than the sum of its proper divisors (408246170868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221421651552 is a wasteful number, since it uses less digits than its factorization.

221421651552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768825195 (or 768825184 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 221421651552 its reverse (255156124122), we get a palindrome (476577775674).

The spelling of 221421651552 in words is "two hundred twenty-one billion, four hundred twenty-one million, six hundred fifty-one thousand, five hundred fifty-two".