21942234 has 24 divisors (see below), whose sum is σ = 49076352. Its totient is φ = 7077960.

The previous prime is 21942209. The next prime is 21942251. The reversal of 21942234 is 43224912.

It is a junction number, because it is equal to n+sod(n) for n = 21942198 and 21942207.

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, 19104 + ... + 20219.

It is an arithmetic number, because the mean of its divisors is an integer number (2044848).

Almost surely, 2^21942234 is an apocalyptic number.

21942234 is an abundant number, since it is smaller than the sum of its proper divisors (27134118).

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

21942234 is a wasteful number, since it uses less digits than its factorization.

21942234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39362 (or 39359 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21942234 is about 4684.2538359914. The cubic root of 21942234 is about 279.9584717322.

The spelling of 21942234 in words is "twenty-one million, nine hundred forty-two thousand, two hundred thirty-four".