221421039 has 16 divisors (see below), whose sum is σ = 357251328. Its totient is φ = 119083392.

The previous prime is 221421029. The next prime is 221421043. The reversal of 221421039 is 930124122.

It is not a de Polignac number, because 221421039 - 2⁸ = 221420783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421019) 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, 309757 + ... + 310470.

It is an arithmetic number, because the mean of its divisors is an integer number (22328208).

Almost surely, 2^221421039 is an apocalyptic number.

221421039 is a deficient number, since it is larger than the sum of its proper divisors (135830289).

221421039 is a wasteful number, since it uses less digits than its factorization.

221421039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620254.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 221421039 is about 14880.2230830052. The cubic root of 221421039 is about 604.9780644552.

The spelling of 221421039 in words is "two hundred twenty-one million, four hundred twenty-one thousand, thirty-nine".