21427107 has 32 divisors (see below), whose sum is σ = 32686080. Its totient is φ = 12389760.

The previous prime is 21427103. The next prime is 21427121. The reversal of 21427107 is 70172412.

It is not a de Polignac number, because 21427107 - 2² = 21427103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21427103) 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, 44494 + ... + 44972.

It is an arithmetic number, because the mean of its divisors is an integer number (1021440).

Almost surely, 2^21427107 is an apocalyptic number.

21427107 is a deficient number, since it is larger than the sum of its proper divisors (11258973).

21427107 is a wasteful number, since it uses less digits than its factorization.

21427107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 21427107 is about 4628.9423197962. The cubic root of 21427107 is about 277.7502847041.

Adding to 21427107 its reverse (70172412), we get a palindrome (91599519).

The spelling of 21427107 in words is "twenty-one million, four hundred twenty-seven thousand, one hundred seven".