21049357 has 8 divisors (see below), whose sum is σ = 24130496. Its totient is φ = 17986752.

The previous prime is 21049333. The next prime is 21049363. The reversal of 21049357 is 75394012.

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

It is not a de Polignac number, because 21049357 - 2²³ = 12660749 is a prime.

It is a super-2 number, since 2×21049357² = 886150860226898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21049307) 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, 2103 + ... + 6820.

It is an arithmetic number, because the mean of its divisors is an integer number (3016312).

Almost surely, 2^21049357 is an apocalyptic number.

It is an amenable number.

21049357 is a deficient number, since it is larger than the sum of its proper divisors (3081139).

21049357 is an equidigital number, since it uses as much as digits as its factorization.

21049357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9267.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21049357 is about 4587.9578245664. The cubic root of 21049357 is about 276.1083949021.

The spelling of 21049357 in words is "twenty-one million, forty-nine thousand, three hundred fifty-seven".