21771050 has 48 divisors (see below), whose sum is σ = 49014720. Its totient is φ = 7023360.

The previous prime is 21771049. The next prime is 21771053. The reversal of 21771050 is 5017712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21771053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4121 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (1021140).

Almost surely, 2^21771050 is an apocalyptic number.

21771050 is an abundant number, since it is smaller than the sum of its proper divisors (27243670).

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

21771050 is a wasteful number, since it uses less digits than its factorization.

21771050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695 (or 3690 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 21771050 is about 4665.9457776532. The cubic root of 21771050 is about 279.2285311276.

Adding to 21771050 its reverse (5017712), we get a palindrome (26788762).

The spelling of 21771050 in words is "twenty-one million, seven hundred seventy-one thousand, fifty".