201021431 has 12 divisors (see below), whose sum is σ = 221662728. Its totient is φ = 181221264.

The previous prime is 201021419. The next prime is 201021461. The reversal of 201021431 is 134120102.

It is not a de Polignac number, because 201021431 - 2⁶ = 201021367 is a prime.

It is a super-2 number, since 2×201021431² = 80819231442575522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19856 + ... + 28218.

It is an arithmetic number, because the mean of its divisors is an integer number (18471894).

Almost surely, 2^201021431 is an apocalyptic number.

201021431 is a deficient number, since it is larger than the sum of its proper divisors (20641297).

201021431 is an equidigital number, since it uses as much as digits as its factorization.

201021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8462 (or 8419 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 201021431 is about 14178.2026717070. The cubic root of 201021431 is about 585.7974183947.

Adding to 201021431 its reverse (134120102), we get a palindrome (335141533).

The spelling of 201021431 in words is "two hundred one million, twenty-one thousand, four hundred thirty-one".