31201421 has 4 divisors (see below), whose sum is σ = 31280412. Its totient is φ = 31122432.

The previous prime is 31201411. The next prime is 31201433. The reversal of 31201421 is 12410213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12410213 = 433 ⋅28661.

It can be written as a sum of positive squares in 2 ways, for example, as 17732521 + 13468900 = 4211^2 + 3670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31201421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201396 and 31201405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38900 + ... + 39693.

It is an arithmetic number, because the mean of its divisors is an integer number (7820103).

Almost surely, 2^31201421 is an apocalyptic number.

It is an amenable number.

31201421 is a deficient number, since it is larger than the sum of its proper divisors (78991).

31201421 is an equidigital number, since it uses as much as digits as its factorization.

31201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78990.

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

The square root of 31201421 is about 5585.8232159638. The cubic root of 31201421 is about 314.8169626139.

Adding to 31201421 its reverse (12410213), we get a palindrome (43611634).

The spelling of 31201421 in words is "thirty-one million, two hundred one thousand, four hundred twenty-one".