20621146633 has 4 divisors (see below), whose sum is σ = 21706470160. Its totient is φ = 19535823108.

The previous prime is 20621146627. The next prime is 20621146643. The reversal of 20621146633 is 33664112602.

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: 33664112602 = 2 ⋅16832056301.

It is a cyclic number.

It is not a de Polignac number, because 20621146633 - 2⁹ = 20621146121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20621146603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542661735 + ... + 542661772.

It is an arithmetic number, because the mean of its divisors is an integer number (5426617540).

Almost surely, 2^20621146633 is an apocalyptic number.

It is an amenable number.

20621146633 is a deficient number, since it is larger than the sum of its proper divisors (1085323527).

20621146633 is a wasteful number, since it uses less digits than its factorization.

20621146633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085323526.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 20621146633 in words is "twenty billion, six hundred twenty-one million, one hundred forty-six thousand, six hundred thirty-three".