21980230 has 16 divisors (see below), whose sum is σ = 39620304. Its totient is φ = 8779680.

The previous prime is 21980197. The next prime is 21980243. The reversal of 21980230 is 3208912.

It is a junction number, because it is equal to n+sod(n) for n = 21980195 and 21980204.

It is a congruent number.

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, 9925 + ... + 11935.

It is an arithmetic number, because the mean of its divisors is an integer number (2476269).

Almost surely, 2^21980230 is an apocalyptic number.

21980230 is a deficient number, since it is larger than the sum of its proper divisors (17640074).

21980230 is a wasteful number, since it uses less digits than its factorization.

21980230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21980230 is about 4688.3077970628. The cubic root of 21980230 is about 280.1199740965.

The spelling of 21980230 in words is "twenty-one million, nine hundred eighty thousand, two hundred thirty".