221038190921 has 8 divisors (see below), whose sum is σ = 230933669760. Its totient is φ = 211166472352.

The previous prime is 221038190897. The next prime is 221038190927. The reversal of 221038190921 is 129091830122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221038190921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221038190927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5921045 + ... + 5958258.

It is an arithmetic number, because the mean of its divisors is an integer number (28866708720).

Almost surely, 2^221038190921 is an apocalyptic number.

It is an amenable number.

221038190921 is a deficient number, since it is larger than the sum of its proper divisors (9895478839).

221038190921 is a wasteful number, since it uses less digits than its factorization.

221038190921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11880135.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 221038190921 in words is "two hundred twenty-one billion, thirty-eight million, one hundred ninety thousand, nine hundred twenty-one".