21010376 has 16 divisors (see below), whose sum is σ = 40459740. Its totient is φ = 10221120.

The previous prime is 21010361. The next prime is 21010397. The reversal of 21010376 is 67301012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15007876 + 6002500 = 3874^2 + 2450^2 .

It is a super-2 number, since 2×21010376² = 882871799322752, 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, 35195 + ... + 35786.

Almost surely, 2^21010376 is an apocalyptic number.

It is an amenable number.

21010376 is a deficient number, since it is larger than the sum of its proper divisors (19449364).

21010376 is a wasteful number, since it uses less digits than its factorization.

21010376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71024 (or 71020 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21010376 is about 4583.7076695618. The cubic root of 21010376 is about 275.9378491997.

Adding to 21010376 its reverse (67301012), we get a palindrome (88311388).

The spelling of 21010376 in words is "twenty-one million, ten thousand, three hundred seventy-six".