21501119 has 2 divisors, whose sum is σ = 21501120. Its totient is φ = 21501118.

The previous prime is 21501101. The next prime is 21501121. The reversal of 21501119 is 91110512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21501119 - 2¹² = 21497023 is a prime.

It is a super-2 number, since 2×21501119² = 924596236504322, which contains 22 as substring.

Together with 21501121, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21501119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21509119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750559 + 10750560.

It is an arithmetic number, because the mean of its divisors is an integer number (10750560).

Almost surely, 2^21501119 is an apocalyptic number.

21501119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501119 is an equidigital number, since it uses as much as digits as its factorization.

21501119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 21501119 is about 4636.9299110511. The cubic root of 21501119 is about 278.0697123449.

The spelling of 21501119 in words is "twenty-one million, five hundred one thousand, one hundred nineteen".