21122220221012 has 6 divisors (see below), whose sum is σ = 36963885386778. Its totient is φ = 10561110110504.

The previous prime is 21122220221009. The next prime is 21122220221023. The reversal of 21122220221012 is 21012202222112.

It can be written as a sum of positive squares in only one way, i.e., 18823224353476 + 2298995867536 = 4338574^2 + 1516244^2 .

It is a super-2 number, since 2×21122220221012² (a number of 27 digits) contains 22 as substring.

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, 2640277527623 + ... + 2640277527630.

It is an arithmetic number, because the mean of its divisors is an integer number (6160647564463).

Almost surely, 2^{21122220221012} is an apocalyptic number.

It is an amenable number.

21122220221012 is a deficient number, since it is larger than the sum of its proper divisors (15841665165766).

21122220221012 is a wasteful number, since it uses less digits than its factorization.

21122220221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280555055257 (or 5280555055255 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122220221012 its reverse (21012202222112), we get a palindrome (42134422443124).

The spelling of 21122220221012 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, two hundred twenty-one thousand, twelve".