53021644 has 12 divisors (see below), whose sum is σ = 99925504. Its totient is φ = 24471504.

The previous prime is 53021621. The next prime is 53021653. The reversal of 53021644 is 44612035.

It is a super-2 number, since 2×53021644² = 5622589464925472, 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, 509772 + ... + 509875.

Almost surely, 2^53021644 is an apocalyptic number.

It is an amenable number.

53021644 is a deficient number, since it is larger than the sum of its proper divisors (46903860).

53021644 is a wasteful number, since it uses less digits than its factorization.

53021644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019664 (or 1019662 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 53021644 is about 7281.5962535697. The cubic root of 53021644 is about 375.6797011983.

Adding to 53021644 its reverse (44612035), we get a palindrome (97633679).

The spelling of 53021644 in words is "fifty-three million, twenty-one thousand, six hundred forty-four".