203157421 has 2 divisors, whose sum is σ = 203157422. Its totient is φ = 203157420.

The previous prime is 203157379. The next prime is 203157433. The reversal of 203157421 is 124751302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200788900 + 2368521 = 14170^2 + 1539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203157421 is a prime.

It is a super-3 number, since 3×203157421³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203157221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101578710 + 101578711.

It is an arithmetic number, because the mean of its divisors is an integer number (101578711).

Almost surely, 2^203157421 is an apocalyptic number.

It is an amenable number.

203157421 is a deficient number, since it is larger than the sum of its proper divisors (1).

203157421 is an equidigital number, since it uses as much as digits as its factorization.

203157421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 203157421 is about 14253.3301722790. The cubic root of 203157421 is about 587.8649451882.

The spelling of 203157421 in words is "two hundred three million, one hundred fifty-seven thousand, four hundred twenty-one".