55077421 has 24 divisors (see below), whose sum is σ = 66977280. Its totient is φ = 45108000.

The previous prime is 55077397. The next prime is 55077427. The reversal of 55077421 is 12477055.

It is not a de Polignac number, because 55077421 - 2¹¹ = 55075373 is a prime.

It is a super-2 number, since 2×55077421² = 6067044608022482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55077427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153240 + ... + 153598.

It is an arithmetic number, because the mean of its divisors is an integer number (2790720).

Almost surely, 2^55077421 is an apocalyptic number.

It is an amenable number.

55077421 is a deficient number, since it is larger than the sum of its proper divisors (11899859).

55077421 is a wasteful number, since it uses less digits than its factorization.

55077421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 55077421 is about 7421.4163742509. The cubic root of 55077421 is about 380.4736038575.

The spelling of 55077421 in words is "fifty-five million, seventy-seven thousand, four hundred twenty-one".