221901954 has 8 divisors (see below), whose sum is σ = 443803920. Its totient is φ = 73967316.

The previous prime is 221901947. The next prime is 221901961. The reversal of 221901954 is 459109122.

221901954 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221901947) and next prime (221901961).

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

221901954 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18491824 + ... + 18491835.

It is an arithmetic number, because the mean of its divisors is an integer number (55475490).

Almost surely, 2^221901954 is an apocalyptic number.

221901954 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221901954 is a wasteful number, since it uses less digits than its factorization.

221901954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36983664.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 221901954 is about 14896.3738540626. The cubic root of 221901954 is about 605.4157413855.

The spelling of 221901954 in words is "two hundred twenty-one million, nine hundred one thousand, nine hundred fifty-four".