221533661055400 has 24 divisors (see below), whose sum is σ = 515065761954270. Its totient is φ = 88613464422080.

The previous prime is 221533661055397. The next prime is 221533661055467. The reversal of 221533661055400 is 4550166335122.

221533661055400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 85391017007076 + 136142644048324 = 9240726^2 + 11668018^2 .

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, 553834152439 + ... + 553834152838.

Almost surely, 2^{221533661055400} is an apocalyptic number.

221533661055400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221533661055400 is an abundant number, since it is smaller than the sum of its proper divisors (293532100898870).

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

221533661055400 is a wasteful number, since it uses less digits than its factorization.

221533661055400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107668305293 (or 1107668305284 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 221533661055400 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, six hundred sixty-one million, fifty-five thousand, four hundred".