21461757 has 8 divisors (see below), whose sum is σ = 28639776. Its totient is φ = 14295792.

The previous prime is 21461753. The next prime is 21461777. The reversal of 21461757 is 75716412.

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

It is not a de Polignac number, because 21461757 - 2² = 21461753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2683 + ... + 7079.

It is an arithmetic number, because the mean of its divisors is an integer number (3579972).

Almost surely, 2^21461757 is an apocalyptic number.

It is an amenable number.

21461757 is a deficient number, since it is larger than the sum of its proper divisors (7178019).

21461757 is a wasteful number, since it uses less digits than its factorization.

21461757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6027.

The product of its digits is 11760, while the sum is 33.

The square root of 21461757 is about 4632.6835635515. The cubic root of 21461757 is about 277.8999217084.

The spelling of 21461757 in words is "twenty-one million, four hundred sixty-one thousand, seven hundred fifty-seven".