21626142 has 32 divisors (see below), whose sum is σ = 48211200. Its totient is φ = 6427008.

The previous prime is 21626131. The next prime is 21626149. The reversal of 21626142 is 24162612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3642 + ... + 7517.

It is an arithmetic number, because the mean of its divisors is an integer number (1506600).

Almost surely, 2^21626142 is an apocalyptic number.

21626142 is an abundant number, since it is smaller than the sum of its proper divisors (26585058).

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

21626142 is a wasteful number, since it uses less digits than its factorization.

21626142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11200.

The product of its digits is 1152, while the sum is 24.

The square root of 21626142 is about 4650.3915964142. The cubic root of 21626142 is about 278.6076369578.

Adding to 21626142 its reverse (24162612), we get a palindrome (45788754).

The spelling of 21626142 in words is "twenty-one million, six hundred twenty-six thousand, one hundred forty-two".