21889719 has 12 divisors (see below), whose sum is σ = 31660200. Its totient is φ = 14573904.

The previous prime is 21889717. The next prime is 21889741. The reversal of 21889719 is 91798812.

It is not a de Polignac number, because 21889719 - 2¹ = 21889717 is a prime.

It is a super-2 number, since 2×21889719² = 958319595797922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10072 + ... + 12050.

It is an arithmetic number, because the mean of its divisors is an integer number (2638350).

Almost surely, 2^21889719 is an apocalyptic number.

21889719 is a deficient number, since it is larger than the sum of its proper divisors (9770481).

21889719 is a wasteful number, since it uses less digits than its factorization.

21889719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 3211 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 21889719 is about 4678.6449961501. The cubic root of 21889719 is about 279.7349490090.

The spelling of 21889719 in words is "twenty-one million, eight hundred eighty-nine thousand, seven hundred nineteen".