21371142 has 64 divisors (see below), whose sum is σ = 49641984. Its totient is φ = 6074880.

The previous prime is 21371113. The next prime is 21371153. The reversal of 21371142 is 24117312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94033 + ... + 94259.

It is an arithmetic number, because the mean of its divisors is an integer number (775656).

Almost surely, 2^21371142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21371142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24820992).

21371142 is an abundant number, since it is smaller than the sum of its proper divisors (28270842).

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

21371142 is a wasteful number, since it uses less digits than its factorization.

21371142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its digits is 336, while the sum is 21.

The square root of 21371142 is about 4622.8932499031. The cubic root of 21371142 is about 277.5082572009.

Adding to 21371142 its reverse (24117312), we get a palindrome (45488454).

The spelling of 21371142 in words is "twenty-one million, three hundred seventy-one thousand, one hundred forty-two".