55135203021 has 12 divisors (see below), whose sum is σ = 79895818080. Its totient is φ = 36638611080.

The previous prime is 55135202917. The next prime is 55135203041. The reversal of 55135203021 is 12030253155.

It is a happy number.

55135203021 is a `hidden beast` number, since 5 + 5 + 1 + 352 + 0 + 302 + 1 = 666.

It is not a de Polignac number, because 55135203021 - 2⁹ = 55135202509 is a prime.

It is a super-2 number, since 2×55135203021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55135203041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9846291 + ... + 9851888.

It is an arithmetic number, because the mean of its divisors is an integer number (6657984840).

Almost surely, 2^55135203021 is an apocalyptic number.

It is an amenable number.

55135203021 is a deficient number, since it is larger than the sum of its proper divisors (24760615059).

55135203021 is a wasteful number, since it uses less digits than its factorization.

55135203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19698496 (or 19698493 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 55135203021 its reverse (12030253155), we get a palindrome (67165456176).

The spelling of 55135203021 in words is "fifty-five billion, one hundred thirty-five million, two hundred three thousand, twenty-one".