21121121222002 has 4 divisors (see below), whose sum is σ = 31681681833006. Its totient is φ = 10560560611000.

The previous prime is 21121121221979. The next prime is 21121121222009. The reversal of 21121121222002 is 20022212112112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12849923533041 + 8271197688961 = 3584679^2 + 2875969^2 .

It is a super-2 number, since 2×21121121222002² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121121222009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280280305499 + ... + 5280280305502.

Almost surely, 2^{21121121222002} is an apocalyptic number.

21121121222002 is a deficient number, since it is larger than the sum of its proper divisors (10560560611004).

21121121222002 is a wasteful number, since it uses less digits than its factorization.

21121121222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560560611003.

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

Adding to 21121121222002 its reverse (20022212112112), we get a palindrome (41143333334114).

The spelling of 21121121222002 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two".