21422097 has 32 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 13608000.

The previous prime is 21422077. The next prime is 21422099. The reversal of 21422097 is 79022412.

It is not a de Polignac number, because 21422097 - 2¹⁸ = 21159953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21422097.

It is not an unprimeable number, because it can be changed into a prime (21422099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85222 + ... + 85472.

It is an arithmetic number, because the mean of its divisors is an integer number (1039500).

Almost surely, 2^21422097 is an apocalyptic number.

21422097 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21422097 is a deficient number, since it is larger than the sum of its proper divisors (11841903).

21422097 is a wasteful number, since it uses less digits than its factorization.

21422097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21422097 is about 4628.4011278194. The cubic root of 21422097 is about 277.7286355318.

The spelling of 21422097 in words is "twenty-one million, four hundred twenty-two thousand, ninety-seven".