201021424 has 10 divisors (see below), whose sum is σ = 389479040. Its totient is φ = 100510704.

The previous prime is 201021419. The next prime is 201021461. The reversal of 201021424 is 424120102.

It is a super-2 number, since 2×201021424² = 80819225813975552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 12563839 = 201021424 / (2 + 0 + 1 + 0 + 2 + 1 + 4 + 2 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 201021398 and 201021407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6281904 + ... + 6281935.

It is an arithmetic number, because the mean of its divisors is an integer number (38947904).

Almost surely, 2^201021424 is an apocalyptic number.

It is an amenable number.

201021424 is a deficient number, since it is larger than the sum of its proper divisors (188457616).

201021424 is a wasteful number, since it uses less digits than its factorization.

201021424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12563847 (or 12563841 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 201021424 is about 14178.2024248492. The cubic root of 201021424 is about 585.7974115951.

Adding to 201021424 its reverse (424120102), we get a palindrome (625141526).

The spelling of 201021424 in words is "two hundred one million, twenty-one thousand, four hundred twenty-four".