21900776 has 8 divisors (see below), whose sum is σ = 41063970. Its totient is φ = 10950384.

The previous prime is 21900773. The next prime is 21900793. The reversal of 21900776 is 67700912.

It can be written as a sum of positive squares in only one way, i.e., 20484676 + 1416100 = 4526^2 + 1190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21900773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1368791 + ... + 1368806.

Almost surely, 2^21900776 is an apocalyptic number.

It is an amenable number.

21900776 is a deficient number, since it is larger than the sum of its proper divisors (19163194).

21900776 is a wasteful number, since it uses less digits than its factorization.

21900776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737603 (or 2737599 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 21900776 is about 4679.8264925102. The cubic root of 21900776 is about 279.7820412641.

The spelling of 21900776 in words is "twenty-one million, nine hundred thousand, seven hundred seventy-six".