21011212022 has 4 divisors (see below), whose sum is σ = 31516818036. Its totient is φ = 10505606010.

The previous prime is 21011211929. The next prime is 21011212031. The reversal of 21011212022 is 22021211012.

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 = 21011211988 and 21011212006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252803004 + ... + 5252803007.

It is an arithmetic number, because the mean of its divisors is an integer number (7879204509).

Almost surely, 2^21011212022 is an apocalyptic number.

21011212022 is a deficient number, since it is larger than the sum of its proper divisors (10505606014).

21011212022 is a wasteful number, since it uses less digits than its factorization.

21011212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505606013.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21011212022 its reverse (22021211012), we get a palindrome (43032423034).

The spelling of 21011212022 in words is "twenty-one billion, eleven million, two hundred twelve thousand, twenty-two".