21422106 has 24 divisors (see below), whose sum is σ = 46785024. Its totient is φ = 7083720.

The previous prime is 21422099. The next prime is 21422117. The reversal of 21422106 is 60122412.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 2400 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (1949376).

Almost surely, 2^21422106 is an apocalyptic number.

21422106 is an abundant number, since it is smaller than the sum of its proper divisors (25362918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21422106 is a wasteful number, since it uses less digits than its factorization.

21422106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9506 (or 9503 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21422106 is about 4628.4021000773. The cubic root of 21422106 is about 277.7286744256.

Adding to 21422106 its reverse (60122412), we get a palindrome (81544518).

It can be divided in two parts, 21422 and 106, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21422106 in words is "twenty-one million, four hundred twenty-two thousand, one hundred six".