21337151 has 4 divisors (see below), whose sum is σ = 23276904. Its totient is φ = 19397400.

The previous prime is 21337117. The next prime is 21337153. The reversal of 21337151 is 15173312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21337151 - 2⁶ = 21337087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969860 + ... + 969881.

It is an arithmetic number, because the mean of its divisors is an integer number (5819226).

Almost surely, 2^21337151 is an apocalyptic number.

21337151 is a deficient number, since it is larger than the sum of its proper divisors (1939753).

21337151 is a wasteful number, since it uses less digits than its factorization.

21337151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939752.

The product of its digits is 630, while the sum is 23.

The square root of 21337151 is about 4619.2154095690. The cubic root of 21337151 is about 277.3610526424.

The spelling of 21337151 in words is "twenty-one million, three hundred thirty-seven thousand, one hundred fifty-one".