21751350 has 24 divisors (see below), whose sum is σ = 53943720. Its totient is φ = 5800320.

The previous prime is 21751343. The next prime is 21751351. The reversal of 21751350 is 5315712.

It is a self number, because there is not a number n which added to its sum of digits gives 21751350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72355 + ... + 72654.

It is an arithmetic number, because the mean of its divisors is an integer number (2247655).

Almost surely, 2^21751350 is an apocalyptic number.

21751350 is an abundant number, since it is smaller than the sum of its proper divisors (32192370).

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

21751350 is a wasteful number, since it uses less digits than its factorization.

21751350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145024 (or 145019 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 21751350 is about 4663.8342594908. The cubic root of 21751350 is about 279.1442837429.

The spelling of 21751350 in words is "twenty-one million, seven hundred fifty-one thousand, three hundred fifty".