55223533021 has 4 divisors (see below), whose sum is σ = 57004937344. Its totient is φ = 53442128700.

The previous prime is 55223532983. The next prime is 55223533033. The reversal of 55223533021 is 12033532255.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55223533021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1781404291 = 55223533021 / (5 + 5 + 2 + 2 + 3 + 5 + 3 + 3 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55223536021) 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, 890702115 + ... + 890702176.

It is an arithmetic number, because the mean of its divisors is an integer number (14251234336).

Almost surely, 2^55223533021 is an apocalyptic number.

It is an amenable number.

55223533021 is a deficient number, since it is larger than the sum of its proper divisors (1781404323).

55223533021 is a wasteful number, since it uses less digits than its factorization.

55223533021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781404322.

The product of its (nonzero) digits is 27000, while the sum is 31.

The spelling of 55223533021 in words is "fifty-five billion, two hundred twenty-three million, five hundred thirty-three thousand, twenty-one".