31421011 has 4 divisors (see below), whose sum is σ = 32434624. Its totient is φ = 30407400.

The previous prime is 31421009. The next prime is 31421053. The reversal of 31421011 is 11012413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11012413 = 17 ⋅647789.

It is a cyclic number.

It is not a de Polignac number, because 31421011 - 2¹ = 31421009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31420982 and 31421000.

It is not an unprimeable number, because it can be changed into a prime (31421081) 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, 506760 + ... + 506821.

It is an arithmetic number, because the mean of its divisors is an integer number (8108656).

Almost surely, 2^31421011 is an apocalyptic number.

31421011 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31421011 is a deficient number, since it is larger than the sum of its proper divisors (1013613).

31421011 is a wasteful number, since it uses less digits than its factorization.

31421011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013612.

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

The square root of 31421011 is about 5605.4447637989. Note that the first 3 decimals coincide. The cubic root of 31421011 is about 315.5537785383.

Adding to 31421011 its reverse (11012413), we get a palindrome (42433424).

The spelling of 31421011 in words is "thirty-one million, four hundred twenty-one thousand, eleven".