221533661055377 has 24 divisors (see below), whose sum is σ = 252320834747520. Its totient is φ = 194220641815200.

The previous prime is 221533661055373. The next prime is 221533661055383. The reversal of 221533661055377 is 773550166335122.

221533661055377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221533661055377 - 2² = 221533661055373 is a prime.

It is a super-2 number, since 2×221533661055377² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221533661055373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269070374 + ... + 269892447.

It is an arithmetic number, because the mean of its divisors is an integer number (10513368114480).

Almost surely, 2^{221533661055377} is an apocalyptic number.

It is an amenable number.

221533661055377 is a deficient number, since it is larger than the sum of its proper divisors (30787173692143).

221533661055377 is a wasteful number, since it uses less digits than its factorization.

221533661055377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538962965 (or 538962954 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 56.

The spelling of 221533661055377 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, six hundred sixty-one million, fifty-five thousand, three hundred seventy-seven".