21954250 has 32 divisors (see below), whose sum is σ = 41462928. Its totient is φ = 8704000.

The previous prime is 21954241. The next prime is 21954263. The reversal of 21954250 is 5245912.

It can be written as a sum of positive squares in 8 ways, for example, as 4289041 + 17665209 = 2071^2 + 4203^2 .

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, 33930 + ... + 34570.

Almost surely, 2^21954250 is an apocalyptic number.

21954250 is a deficient number, since it is larger than the sum of its proper divisors (19508678).

21954250 is a wasteful number, since it uses less digits than its factorization.

21954250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 21954250 is about 4685.5362553287. The cubic root of 21954250 is about 280.0095659997.

It can be divided in two parts, 21 and 954250, that added together give a triangular number (954271 = T₁₃₈₁).

The spelling of 21954250 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred fifty".