21121222121002 has 16 divisors (see below), whose sum is σ = 32084975260800. Its totient is φ = 10426247919360.

The previous prime is 21121222120997. The next prime is 21121222121029. The reversal of 21121222121002 is 20012122212112.

It is a super-2 number, since 2×21121222121002² (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 7 ways as a sum of consecutive naturals, for example, 1969399 + ... + 6791242.

It is an arithmetic number, because the mean of its divisors is an integer number (2005310953800).

Almost surely, 2^{21121222121002} is an apocalyptic number.

21121222121002 is a deficient number, since it is larger than the sum of its proper divisors (10963753139798).

21121222121002 is a wasteful number, since it uses less digits than its factorization.

21121222121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8775981.

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

Adding to 21121222121002 its reverse (20012122212112), we get a palindrome (41133344333114).

The spelling of 21121222121002 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two".