21131033 has 16 divisors (see below), whose sum is σ = 27060864. Its totient is φ = 16018560.

The previous prime is 21131029. The next prime is 21131039. The reversal of 21131033 is 33013112.

21131033 = T₃₀₇ + T₃₀₈ + ... + T₅₃₇.

It is a cyclic number.

It is not a de Polignac number, because 21131033 - 2² = 21131029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130999 and 21131017.

It is not an unprimeable number, because it can be changed into a prime (21131039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1691304).

Almost surely, 2^21131033 is an apocalyptic number.

It is an amenable number.

21131033 is a deficient number, since it is larger than the sum of its proper divisors (5929831).

21131033 is a wasteful number, since it uses less digits than its factorization.

21131033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7472.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21131033 is about 4596.8503347401. The cubic root of 21131033 is about 276.4650538387.

Adding to 21131033 its reverse (33013112), we get a palindrome (54144145).

The spelling of 21131033 in words is "twenty-one million, one hundred thirty-one thousand, thirty-three".