21877142 has 8 divisors (see below), whose sum is σ = 37503696. Its totient is φ = 9375912.

The previous prime is 21877133. The next prime is 21877157. The reversal of 21877142 is 24177812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21877099 and 21877108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781313 + ... + 781340.

It is an arithmetic number, because the mean of its divisors is an integer number (4687962).

Almost surely, 2^21877142 is an apocalyptic number.

21877142 is a deficient number, since it is larger than the sum of its proper divisors (15626554).

21877142 is a wasteful number, since it uses less digits than its factorization.

21877142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562662.

The product of its digits is 6272, while the sum is 32.

The square root of 21877142 is about 4677.3007172941. The cubic root of 21877142 is about 279.6813637242.

The spelling of 21877142 in words is "twenty-one million, eight hundred seventy-seven thousand, one hundred forty-two".