21954602 has 4 divisors (see below), whose sum is σ = 32931906. Its totient is φ = 10977300.

The previous prime is 21954601. The next prime is 21954607. The reversal of 21954602 is 20645912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 434281 = 4639^2 + 659^2 .

It is not an unprimeable number, because it can be changed into a prime (21954601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5488649 + ... + 5488652.

Almost surely, 2^21954602 is an apocalyptic number.

21954602 is a deficient number, since it is larger than the sum of its proper divisors (10977304).

21954602 is a wasteful number, since it uses less digits than its factorization.

21954602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10977303.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21954602 is about 4685.5738175809. The cubic root of 21954602 is about 280.0110624881.

The spelling of 21954602 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred two".