21954046 has 16 divisors (see below), whose sum is σ = 33487344. Its totient is φ = 10793344.

The previous prime is 21954019. The next prime is 21954047. The reversal of 21954046 is 64045912.

It is a junction number, because it is equal to n+sod(n) for n = 21953999 and 21954017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36726 + ... + 37318.

It is an arithmetic number, because the mean of its divisors is an integer number (2092959).

Almost surely, 2^21954046 is an apocalyptic number.

21954046 is a deficient number, since it is larger than the sum of its proper divisors (11533298).

21954046 is a wasteful number, since it uses less digits than its factorization.

21954046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21954046 is about 4685.5144861584. The cubic root of 21954046 is about 280.0086987093.

Adding to 21954046 its reverse (64045912), we get a palindrome (85999958).

It can be divided in two parts, 2195 and 4046, that added together give a square (6241 = 79²).

The spelling of 21954046 in words is "twenty-one million, nine hundred fifty-four thousand, forty-six".