21954116 has 6 divisors (see below), whose sum is σ = 38419710. Its totient is φ = 10977056.

The previous prime is 21954103. The next prime is 21954143. The reversal of 21954116 is 61145912.

It can be written as a sum of positive squares in only one way, i.e., 11195716 + 10758400 = 3346^2 + 3280^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2744261 + ... + 2744268.

It is an arithmetic number, because the mean of its divisors is an integer number (6403285).

Almost surely, 2^21954116 is an apocalyptic number.

It is an amenable number.

21954116 is a deficient number, since it is larger than the sum of its proper divisors (16465594).

21954116 is a wasteful number, since it uses less digits than its factorization.

21954116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5488533 (or 5488531 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 21954116 is about 4685.5219559831. The cubic root of 21954116 is about 280.0089963096.

The spelling of 21954116 in words is "twenty-one million, nine hundred fifty-four thousand, one hundred sixteen".