21222767246 has 4 divisors (see below), whose sum is σ = 31834150872. Its totient is φ = 10611383622.

The previous prime is 21222767197. The next prime is 21222767249. The reversal of 21222767246 is 64276722212.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222767249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305691810 + ... + 5305691813.

It is an arithmetic number, because the mean of its divisors is an integer number (7958537718).

Almost surely, 2^21222767246 is an apocalyptic number.

21222767246 is a deficient number, since it is larger than the sum of its proper divisors (10611383626).

21222767246 is a wasteful number, since it uses less digits than its factorization.

21222767246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611383625.

The product of its digits is 225792, while the sum is 41.

The spelling of 21222767246 in words is "twenty-one billion, two hundred twenty-two million, seven hundred sixty-seven thousand, two hundred forty-six".