221681052030 has 32 divisors (see below), whose sum is σ = 555166462464. Its totient is φ = 56544731936.

The previous prime is 221681051957. The next prime is 221681052041. The reversal of 221681052030 is 30250186122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160637754 + ... + 160639133.

It is an arithmetic number, because the mean of its divisors is an integer number (17348951952).

Almost surely, 2^221681052030 is an apocalyptic number.

221681052030 is an abundant number, since it is smaller than the sum of its proper divisors (333485410434).

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

221681052030 is a wasteful number, since it uses less digits than its factorization.

221681052030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321276920.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 221681052030 in words is "two hundred twenty-one billion, six hundred eighty-one million, fifty-two thousand, thirty".