21221111222002 has 16 divisors (see below), whose sum is σ = 32299197840000. Its totient is φ = 10455250263120.

The previous prime is 21221111221949. The next prime is 21221111222009. The reversal of 21221111222002 is 20022211112212.

It is a super-2 number, since 2×21221111222002² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21221111222009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134501149 + ... + 134658832.

It is an arithmetic number, because the mean of its divisors is an integer number (2018699865000).

Almost surely, 2^{21221111222002} is an apocalyptic number.

21221111222002 is a deficient number, since it is larger than the sum of its proper divisors (11078086617998).

21221111222002 is a wasteful number, since it uses less digits than its factorization.

21221111222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269160561.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221111222002 its reverse (20022211112212), we get a palindrome (41243322334214).

The spelling of 21221111222002 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two".