5621650121 has 4 divisors (see below), whose sum is σ = 5658879744. Its totient is φ = 5584420500.

The previous prime is 5621650103. The next prime is 5621650169. The reversal of 5621650121 is 1210561265.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1210561265 = 5 ⋅242112253.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5621650121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5621658121) 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, 18614585 + ... + 18614886.

It is an arithmetic number, because the mean of its divisors is an integer number (1414719936).

Almost surely, 2^5621650121 is an apocalyptic number.

It is an amenable number.

5621650121 is a deficient number, since it is larger than the sum of its proper divisors (37229623).

5621650121 is a wasteful number, since it uses less digits than its factorization.

5621650121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37229622.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 5621650121 is about 74977.6641473979. The cubic root of 5621650121 is about 1778.0935402965.

The spelling of 5621650121 in words is "five billion, six hundred twenty-one million, six hundred fifty thousand, one hundred twenty-one".