21401750 has 16 divisors (see below), whose sum is σ = 40064544. Its totient is φ = 8560600.

The previous prime is 21401717. The next prime is 21401761. The reversal of 21401750 is 5710412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42554 + ... + 43053.

It is an arithmetic number, because the mean of its divisors is an integer number (2504034).

Almost surely, 2^21401750 is an apocalyptic number.

21401750 is a deficient number, since it is larger than the sum of its proper divisors (18662794).

21401750 is an equidigital number, since it uses as much as digits as its factorization.

21401750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85624 (or 85614 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21401750 is about 4626.2025463656. The cubic root of 21401750 is about 277.6406775290.

The spelling of 21401750 in words is "twenty-one million, four hundred one thousand, seven hundred fifty".