21751050 has 24 divisors (see below), whose sum is σ = 53942976. Its totient is φ = 5800240.

The previous prime is 21751043. The next prime is 21751069. The reversal of 21751050 is 5015712.

It is a super-2 number, since 2×21751050² = 946216352205000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72354 + ... + 72653.

It is an arithmetic number, because the mean of its divisors is an integer number (2247624).

Almost surely, 2^21751050 is an apocalyptic number.

21751050 is an abundant number, since it is smaller than the sum of its proper divisors (32191926).

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

21751050 is a wasteful number, since it uses less digits than its factorization.

21751050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145022 (or 145017 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 21751050 is about 4663.8020970020. The cubic root of 21751050 is about 279.1430003947.

Adding to 21751050 its reverse (5015712), we get a palindrome (26766762).

The spelling of 21751050 in words is "twenty-one million, seven hundred fifty-one thousand, fifty".