153220421 has 4 divisors (see below), whose sum is σ = 155160000. Its totient is φ = 151280844.

The previous prime is 153220409. The next prime is 153220447. The reversal of 153220421 is 124022351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 153220421 - 2¹⁸ = 152958277 is a prime.

It is a super-2 number, since 2×153220421² = 46952994822834482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 153220393 and 153220402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153220121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969671 + ... + 969828.

It is an arithmetic number, because the mean of its divisors is an integer number (38790000).

Almost surely, 2^153220421 is an apocalyptic number.

It is an amenable number.

153220421 is a deficient number, since it is larger than the sum of its proper divisors (1939579).

153220421 is an equidigital number, since it uses as much as digits as its factorization.

153220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939578.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 153220421 is about 12378.2236609297. The cubic root of 153220421 is about 535.1048456700.

Adding to 153220421 its reverse (124022351), we get a palindrome (277242772).

The spelling of 153220421 in words is "one hundred fifty-three million, two hundred twenty thousand, four hundred twenty-one".