73127421 has 16 divisors (see below), whose sum is σ = 114710400. Its totient is φ = 45883584.

The previous prime is 73127393. The next prime is 73127437. The reversal of 73127421 is 12472137.

It is a happy number.

It is not a de Polignac number, because 73127421 - 2⁵ = 73127389 is a prime.

It is a super-2 number, since 2×73127421² = 10695239404222482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73127921) 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, 79201 + ... + 80118.

It is an arithmetic number, because the mean of its divisors is an integer number (7169400).

Almost surely, 2^73127421 is an apocalyptic number.

It is an amenable number.

73127421 is a deficient number, since it is larger than the sum of its proper divisors (41582979).

73127421 is a wasteful number, since it uses less digits than its factorization.

73127421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159345 (or 159339 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 73127421 is about 8551.4572442362. The cubic root of 73127421 is about 418.1769452245.

Adding to 73127421 its reverse (12472137), we get a palindrome (85599558).

The spelling of 73127421 in words is "seventy-three million, one hundred twenty-seven thousand, four hundred twenty-one".