21012010022 has 4 divisors (see below), whose sum is σ = 31518015036. Its totient is φ = 10506005010.

The previous prime is 21012009971. The next prime is 21012010027. The reversal of 21012010022 is 22001021012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21012009985 and 21012010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012010027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253002504 + ... + 5253002507.

It is an arithmetic number, because the mean of its divisors is an integer number (7879503759).

Almost surely, 2^21012010022 is an apocalyptic number.

21012010022 is a deficient number, since it is larger than the sum of its proper divisors (10506005014).

21012010022 is a wasteful number, since it uses less digits than its factorization.

21012010022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506005013.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21012010022 its reverse (22001021012), we get a palindrome (43013031034).

The spelling of 21012010022 in words is "twenty-one billion, twelve million, ten thousand, twenty-two".