20010221033 has 4 divisors (see below), whose sum is σ = 21829332048. Its totient is φ = 18191110020.

The previous prime is 20010220987. The next prime is 20010221039. The reversal of 20010221033 is 33012201002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20010221033 - 2²⁰ = 20009172457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010220999 and 20010221017.

It is not an unprimeable number, because it can be changed into a prime (20010221039) 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, 909555491 + ... + 909555512.

It is an arithmetic number, because the mean of its divisors is an integer number (5457333012).

Almost surely, 2^20010221033 is an apocalyptic number.

It is an amenable number.

20010221033 is a deficient number, since it is larger than the sum of its proper divisors (1819111015).

20010221033 is a wasteful number, since it uses less digits than its factorization.

20010221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819111014.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20010221033 its reverse (33012201002), we get a palindrome (53022422035).

The spelling of 20010221033 in words is "twenty billion, ten million, two hundred twenty-one thousand, thirty-three".