10521638 has 4 divisors (see below), whose sum is σ = 15782460. Its totient is φ = 5260818.

The previous prime is 10521629. The next prime is 10521659. The reversal of 10521638 is 83612501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83612501 = 7 ⋅11944643.

It is a super-2 number, since 2×10521638² = 221409732406088, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630408 + ... + 2630411.

It is an arithmetic number, because the mean of its divisors is an integer number (3945615).

Almost surely, 2^10521638 is an apocalyptic number.

10521638 is a deficient number, since it is larger than the sum of its proper divisors (5260822).

10521638 is an equidigital number, since it uses as much as digits as its factorization.

10521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260821.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 10521638 is about 3243.7074467344. The cubic root of 10521638 is about 219.1262728900.

The spelling of 10521638 in words is "ten million, five hundred twenty-one thousand, six hundred thirty-eight".