201424921 has 4 divisors (see below), whose sum is σ = 203011072. Its totient is φ = 199838772.

The previous prime is 201424919. The next prime is 201424931. The reversal of 201424921 is 129424102.

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 201424921 - 2¹ = 201424919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201424931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792885 + ... + 793138.

It is an arithmetic number, because the mean of its divisors is an integer number (50752768).

Almost surely, 2^201424921 is an apocalyptic number.

It is an amenable number.

201424921 is a deficient number, since it is larger than the sum of its proper divisors (1586151).

201424921 is a wasteful number, since it uses less digits than its factorization.

201424921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586150.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 201424921 is about 14192.4247752102. The cubic root of 201424921 is about 586.1890937706.

The spelling of 201424921 in words is "two hundred one million, four hundred twenty-four thousand, nine hundred twenty-one".