53621621 has 16 divisors (see below), whose sum is σ = 58780224. Its totient is φ = 48708864.

The previous prime is 53621611. The next prime is 53621657. The reversal of 53621621 is 12612635.

It is a cyclic number.

It is not a de Polignac number, because 53621621 - 2¹⁸ = 53359477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53621611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102266 + ... + 102788.

It is an arithmetic number, because the mean of its divisors is an integer number (3673764).

Almost surely, 2^53621621 is an apocalyptic number.

It is an amenable number.

53621621 is a deficient number, since it is larger than the sum of its proper divisors (5158603).

53621621 is a wasteful number, since it uses less digits than its factorization.

53621621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 2160, while the sum is 26.

The square root of 53621621 is about 7322.6785399879. The cubic root of 53621621 is about 377.0914158912.

The spelling of 53621621 in words is "fifty-three million, six hundred twenty-one thousand, six hundred twenty-one".