54905021 has 4 divisors (see below), whose sum is σ = 55337472. Its totient is φ = 54472572.

The previous prime is 54905009. The next prime is 54905047. The reversal of 54905021 is 12050945.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12050945 = 5 ⋅2410189.

It is a cyclic number.

It is not a de Polignac number, because 54905021 - 2⁶ = 54904957 is a prime.

It is a super-2 number, since 2×54905021² = 6029122662020882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54905621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216035 + ... + 216288.

It is an arithmetic number, because the mean of its divisors is an integer number (13834368).

Almost surely, 2^54905021 is an apocalyptic number.

It is an amenable number.

54905021 is a deficient number, since it is larger than the sum of its proper divisors (432451).

54905021 is a wasteful number, since it uses less digits than its factorization.

54905021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432450.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 54905021 is about 7409.7922373033. The cubic root of 54905021 is about 380.0762104764.

Adding to 54905021 its reverse (12050945), we get a palindrome (66955966).

The spelling of 54905021 in words is "fifty-four million, nine hundred five thousand, twenty-one".