21357703 has 2 divisors, whose sum is σ = 21357704. Its totient is φ = 21357702.

The previous prime is 21357701. The next prime is 21357709. The reversal of 21357703 is 30775312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21357703 - 2¹ = 21357701 is a prime.

It is a super-3 number, since 3×21357703³ (a number of 23 digits) contains 333 as substring.

Together with 21357701, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21357701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678851 + 10678852.

It is an arithmetic number, because the mean of its divisors is an integer number (10678852).

Almost surely, 2^21357703 is an apocalyptic number.

21357703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21357703 is an equidigital number, since it uses as much as digits as its factorization.

21357703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 21357703 is about 4621.4394943567. The cubic root of 21357703 is about 277.4500756981.

The spelling of 21357703 in words is "twenty-one million, three hundred fifty-seven thousand, seven hundred three".