21954030 has 32 divisors (see below), whose sum is σ = 60217344. Its totient is φ = 5018016.

The previous prime is 21954019. The next prime is 21954047. The reversal of 21954030 is 3045912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52062 + ... + 52481.

It is an arithmetic number, because the mean of its divisors is an integer number (1881792).

Almost surely, 2^21954030 is an apocalyptic number.

21954030 is an abundant number, since it is smaller than the sum of its proper divisors (38263314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21954030 is a wasteful number, since it uses less digits than its factorization.

21954030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104560.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21954030 is about 4685.5127787682. The cubic root of 21954030 is about 280.0086306863.

Adding to 21954030 its reverse (3045912), we get a palindrome (24999942).

The spelling of 21954030 in words is "twenty-one million, nine hundred fifty-four thousand, thirty".