21047876 has 12 divisors (see below), whose sum is σ = 36895740. Its totient is φ = 10506240.

The previous prime is 21047861. The next prime is 21047893. The reversal of 21047876 is 67874012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 11062276 = 3160^2 + 3326^2 .

It is a super-2 number, since 2×21047876² = 886026168222752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (3074645).

Almost surely, 2^21047876 is an apocalyptic number.

It is an amenable number.

21047876 is a deficient number, since it is larger than the sum of its proper divisors (15847864).

21047876 is a wasteful number, since it uses less digits than its factorization.

21047876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854 (or 8852 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 21047876 is about 4587.7964209411. The cubic root of 21047876 is about 276.1019192312.

The spelling of 21047876 in words is "twenty-one million, forty-seven thousand, eight hundred seventy-six".