21221121111002 has 4 divisors (see below), whose sum is σ = 31831681666506. Its totient is φ = 10610560555500.

The previous prime is 21221121110953. The next prime is 21221121111019. The reversal of 21221121111002 is 20011112112212.

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., 13969362228721 + 7251758882281 = 3737561^2 + 2692909^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305280277749 + ... + 5305280277752.

Almost surely, 2^{21221121111002} is an apocalyptic number.

21221121111002 is a deficient number, since it is larger than the sum of its proper divisors (10610560555504).

21221121111002 is a wasteful number, since it uses less digits than its factorization.

21221121111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610560555503.

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

Adding to 21221121111002 its reverse (20011112112212), we get a palindrome (41232233223214).

The spelling of 21221121111002 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, two".