21020220023 has 8 divisors (see below), whose sum is σ = 22991026176. Its totient is φ = 19059393400.

The previous prime is 21020219963. The next prime is 21020220037. The reversal of 21020220023 is 32002202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020220023 - 2²⁰ = 21019171447 is a prime.

It is a super-3 number, since 3×21020220023³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020220323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2490473 + ... + 2498898.

It is an arithmetic number, because the mean of its divisors is an integer number (2873878272).

Almost surely, 2^21020220023 is an apocalyptic number.

21020220023 is a deficient number, since it is larger than the sum of its proper divisors (1970806153).

21020220023 is a wasteful number, since it uses less digits than its factorization.

21020220023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989765.

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21020220023 its reverse (32002202012), we get a palindrome (53022422035).

The spelling of 21020220023 in words is "twenty-one billion, twenty million, two hundred twenty thousand, twenty-three".