221202138 has 16 divisors (see below), whose sum is σ = 447735456. Its totient is φ = 72845520.

The previous prime is 221202131. The next prime is 221202173. The reversal of 221202138 is 831202122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221202131) 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, 221593 + ... + 222588.

It is an arithmetic number, because the mean of its divisors is an integer number (27983466).

Almost surely, 2^221202138 is an apocalyptic number.

221202138 is an abundant number, since it is smaller than the sum of its proper divisors (226533318).

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

221202138 is a wasteful number, since it uses less digits than its factorization.

221202138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444269.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 221202138 is about 14872.8658300948. The cubic root of 221202138 is about 604.7786344931.

The spelling of 221202138 in words is "two hundred twenty-one million, two hundred two thousand, one hundred thirty-eight".