5621020251 has 24 divisors (see below), whose sum is σ = 9510894144. Its totient is φ = 2920009680.

The previous prime is 5621020217. The next prime is 5621020271. The reversal of 5621020251 is 1520201265.

It is a happy number.

It is not a de Polignac number, because 5621020251 - 2¹⁵ = 5620987483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5621020271) 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, 1736485 + ... + 1739718.

It is an arithmetic number, because the mean of its divisors is an integer number (396287256).

Almost surely, 2^5621020251 is an apocalyptic number.

5621020251 is a deficient number, since it is larger than the sum of its proper divisors (3889873893).

5621020251 is a wasteful number, since it uses less digits than its factorization.

5621020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476231 (or 3476224 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 5621020251 is about 74973.4636454793. The cubic root of 5621020251 is about 1778.0271298070.

The spelling of 5621020251 in words is "five billion, six hundred twenty-one million, twenty thousand, two hundred fifty-one".