221356951356 has 48 divisors (see below), whose sum is σ = 528246157824. Its totient is φ = 72118153536.

The previous prime is 221356951351. The next prime is 221356951369. The reversal of 221356951356 is 653159653122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221356951351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494416 + ... + 828951.

It is an arithmetic number, because the mean of its divisors is an integer number (11005128288).

Almost surely, 2^221356951356 is an apocalyptic number.

It is an amenable number.

221356951356 is an abundant number, since it is smaller than the sum of its proper divisors (306889206468).

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

221356951356 is a wasteful number, since it uses less digits than its factorization.

221356951356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323690 (or 1323688 counting only the distinct ones).

The product of its digits is 1458000, while the sum is 48.

The spelling of 221356951356 in words is "two hundred twenty-one billion, three hundred fifty-six million, nine hundred fifty-one thousand, three hundred fifty-six".