213519221 has 2 divisors, whose sum is σ = 213519222. Its totient is φ = 213519220.

The previous prime is 213519217. The next prime is 213519259. The reversal of 213519221 is 122915312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212284900 + 1234321 = 14570^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 213519221 - 2² = 213519217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213519211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106759610 + 106759611.

It is an arithmetic number, because the mean of its divisors is an integer number (106759611).

Almost surely, 2^213519221 is an apocalyptic number.

It is an amenable number.

213519221 is a deficient number, since it is larger than the sum of its proper divisors (1).

213519221 is an equidigital number, since it uses as much as digits as its factorization.

213519221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 213519221 is about 14612.2969104792. The cubic root of 213519221 is about 597.6941320479.

The spelling of 213519221 in words is "two hundred thirteen million, five hundred nineteen thousand, two hundred twenty-one".