21040476 has 12 divisors (see below), whose sum is σ = 49094472. Its totient is φ = 7013488.

The previous prime is 21040463. The next prime is 21040489. The reversal of 21040476 is 67404012.

It is an interprime number because it is at equal distance from previous prime (21040463) and next prime (21040489).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 876675 + ... + 876698.

It is an arithmetic number, because the mean of its divisors is an integer number (4091206).

Almost surely, 2^21040476 is an apocalyptic number.

It is an amenable number.

21040476 is an abundant number, since it is smaller than the sum of its proper divisors (28053996).

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

21040476 is a wasteful number, since it uses less digits than its factorization.

21040476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753380 (or 1753378 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21040476 is about 4586.9898626441. The cubic root of 21040476 is about 276.0695581877.

Adding to 21040476 its reverse (67404012), we get a palindrome (88444488).

The spelling of 21040476 in words is "twenty-one million, forty thousand, four hundred seventy-six".