6121536021 has 24 divisors (see below), whose sum is σ = 9197730360. Its totient is φ = 3918499200.

The previous prime is 6121535983. The next prime is 6121536059. The reversal of 6121536021 is 1206351216.

6121536021 is a `hidden beast` number, since 6 + 1 + 2 + 1 + 53 + 602 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6121535983) and next prime (6121536059).

It can be written as a sum of positive squares in 4 ways, for example, as 570540996 + 5550995025 = 23886^2 + 74505^2 .

It is not a de Polignac number, because 6121536021 - 2¹⁵ = 6121503253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6121536061) 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 23 ways as a sum of consecutive naturals, for example, 17550 + ... + 112031.

It is an arithmetic number, because the mean of its divisors is an integer number (383238765).

Almost surely, 2^6121536021 is an apocalyptic number.

It is an amenable number.

6121536021 is a deficient number, since it is larger than the sum of its proper divisors (3076194339).

6121536021 is a wasteful number, since it uses less digits than its factorization.

6121536021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129797 (or 129794 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 6121536021 is about 78240.2455325902. The cubic root of 6121536021 is about 1829.3078713797.

Adding to 6121536021 its reverse (1206351216), we get a palindrome (7327887237).

The spelling of 6121536021 in words is "six billion, one hundred twenty-one million, five hundred thirty-six thousand, twenty-one".