221396 has 12 divisors (see below), whose sum is σ = 442848. Its totient is φ = 94872.

The previous prime is 221393. The next prime is 221399. The reversal of 221396 is 693122.

221396 = T₂₄₈ + T₂₄₉ + ... + T₂₅₄.

It is an interprime number because it is at equal distance from previous prime (221393) and next prime (221399).

221396 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (36904).

2²²¹³⁹⁶ is an apocalyptic number.

It is an amenable number.

221396 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.

221396 is a wasteful number, since it uses less digits than its factorization.

221396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918 (or 7916 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 221396 is about 470.5273637101. The cubic root of 221396 is about 60.4955259310.

The spelling of 221396 in words is "two hundred twenty-one thousand, three hundred ninety-six".