21111221121002 has 16 divisors (see below), whose sum is σ = 33046578847872. Its totient is φ = 10095776182800.

The previous prime is 21111221120981. The next prime is 21111221121169. The reversal of 21111221121002 is 20012112211112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19811249 + ... + 20849652.

It is an arithmetic number, because the mean of its divisors is an integer number (2065411177992).

Almost surely, 2^{21111221121002} is an apocalyptic number.

21111221121002 is a deficient number, since it is larger than the sum of its proper divisors (11935357726870).

21111221121002 is a wasteful number, since it uses less digits than its factorization.

21111221121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40672213.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111221121002 its reverse (20012112211112), we get a palindrome (41123333332114).

The spelling of 21111221121002 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two".