31101421 has 8 divisors (see below), whose sum is σ = 33689880. Its totient is φ = 28540992.

The previous prime is 31101419. The next prime is 31101439. The reversal of 31101421 is 12410113.

It can be written as a sum of positive squares in 4 ways, for example, as 1822500 + 29278921 = 1350^2 + 5411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31101421 - 2¹ = 31101419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4666 + ... + 9163.

It is an arithmetic number, because the mean of its divisors is an integer number (4211235).

Almost surely, 2^31101421 is an apocalyptic number.

It is an amenable number.

31101421 is a deficient number, since it is larger than the sum of its proper divisors (2588459).

31101421 is a wasteful number, since it uses less digits than its factorization.

31101421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14015.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 31101421 is about 5576.8648002260. The cubic root of 31101421 is about 314.4802750740.

Adding to 31101421 its reverse (12410113), we get a palindrome (43511534).

The spelling of 31101421 in words is "thirty-one million, one hundred one thousand, four hundred twenty-one".