21942212 has 48 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 10028928.

The previous prime is 21942209. The next prime is 21942251. The reversal of 21942212 is 21224912.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264323 + ... + 264405.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^21942212 is an apocalyptic number.

It is an amenable number.

21942212 is a deficient number, since it is larger than the sum of its proper divisors (19970428).

21942212 is a wasteful number, since it uses less digits than its factorization.

21942212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 210 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 21942212 is about 4684.2514876979. The cubic root of 21942212 is about 279.9583781670.

The spelling of 21942212 in words is "twenty-one million, nine hundred forty-two thousand, two hundred twelve".