219970421 has 12 divisors (see below), whose sum is σ = 241936800. Its totient is φ = 198340560.

The previous prime is 219970417. The next prime is 219970427. The reversal of 219970421 is 124079912.

It is not a de Polignac number, because 219970421 - 2² = 219970417 is a prime.

It is a super-2 number, since 2×219970421² = 96773972229834482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219970427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 693755 + ... + 694071.

It is an arithmetic number, because the mean of its divisors is an integer number (20161400).

Almost surely, 2^219970421 is an apocalyptic number.

It is an amenable number.

219970421 is a deficient number, since it is larger than the sum of its proper divisors (21966379).

219970421 is an equidigital number, since it uses as much as digits as its factorization.

219970421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 219970421 is about 14831.3998327872. The cubic root of 219970421 is about 603.6540174937.

The spelling of 219970421 in words is "two hundred nineteen million, nine hundred seventy thousand, four hundred twenty-one".