21212020023 has 8 divisors (see below), whose sum is σ = 28363734000. Its totient is φ = 14100826368.

The previous prime is 21212020021. The next prime is 21212020087. The reversal of 21212020023 is 32002021212.

It is a happy number.

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

It is not a de Polignac number, because 21212020023 - 2¹ = 21212020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212019984 and 21212020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212020021) 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, 10128858 + ... + 10130951.

It is an arithmetic number, because the mean of its divisors is an integer number (3545466750).

Almost surely, 2^21212020023 is an apocalyptic number.

21212020023 is a deficient number, since it is larger than the sum of its proper divisors (7151713977).

21212020023 is a wasteful number, since it uses less digits than its factorization.

21212020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20260161.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21212020023 its reverse (32002021212), we get a palindrome (53214041235).

The spelling of 21212020023 in words is "twenty-one billion, two hundred twelve million, twenty thousand, twenty-three".