21221012222002 has 32 divisors (see below), whose sum is σ = 33050580228720. Its totient is φ = 10206856154880.

The previous prime is 21221012221951. The next prime is 21221012222077. The reversal of 21221012222002 is 20022221012212.

It can be written as a sum of positive squares in 8 ways, for example, as 9763931323441 + 11457080898561 = 3124729^2 + 3384831^2 .

It is a super-2 number, since 2×21221012222002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245397052 + ... + 245483512.

Almost surely, 2^{21221012222002} is an apocalyptic number.

21221012222002 is a deficient number, since it is larger than the sum of its proper divisors (11829568006718).

21221012222002 is a wasteful number, since it uses less digits than its factorization.

21221012222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102046.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21221012222002 its reverse (20022221012212), we get a palindrome (41243233234214).

The spelling of 21221012222002 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two".