21222722212 has 12 divisors (see below), whose sum is σ = 37141411356. Its totient is φ = 10610890400.

The previous prime is 21222722177. The next prime is 21222722237.

21222722212 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 11918962276 + 9303759936 = 109174^2 + 96456^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4039 + ... + 206062.

It is an arithmetic number, because the mean of its divisors is an integer number (3095117613).

Almost surely, 2^21222722212 is an apocalyptic number.

It is an amenable number.

21222722212 is a deficient number, since it is larger than the sum of its proper divisors (15918689144).

21222722212 is a wasteful number, since it uses less digits than its factorization.

21222722212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235358 (or 235356 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The spelling of 21222722212 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-two thousand, two hundred twelve".