21495386 has 24 divisors (see below), whose sum is σ = 36789984. Its totient is φ = 9340760.

The previous prime is 21495371. The next prime is 21495391. The reversal of 21495386 is 68359412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10715 + ... + 12561.

It is an arithmetic number, because the mean of its divisors is an integer number (1532916).

Almost surely, 2^21495386 is an apocalyptic number.

21495386 is a deficient number, since it is larger than the sum of its proper divisors (15294598).

21495386 is a wasteful number, since it uses less digits than its factorization.

21495386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1883 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 21495386 is about 4636.3116806358. The cubic root of 21495386 is about 278.0449955635.

The spelling of 21495386 in words is "twenty-one million, four hundred ninety-five thousand, three hundred eighty-six".