21980794 has 16 divisors (see below), whose sum is σ = 36133920. Its totient is φ = 9945360.

The previous prime is 21980789. The next prime is 21980809. The reversal of 21980794 is 49708912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2857 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (2258370).

Almost surely, 2^21980794 is an apocalyptic number.

21980794 is a deficient number, since it is larger than the sum of its proper divisors (14153126).

21980794 is a wasteful number, since it uses less digits than its factorization.

21980794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 21980794 is about 4688.3679463114. The cubic root of 21980794 is about 280.1223699816.

The spelling of 21980794 in words is "twenty-one million, nine hundred eighty thousand, seven hundred ninety-four".