21102001122002 has 4 divisors (see below), whose sum is σ = 31653001683006. Its totient is φ = 10551000561000.

The previous prime is 21102001121963. The next prime is 21102001122011. The reversal of 21102001122002 is 20022110020112.

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., 17763198758881 + 3338802363121 = 4214641^2 + 1827239^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275500280499 + ... + 5275500280502.

Almost surely, 2^{21102001122002} is an apocalyptic number.

21102001122002 is a deficient number, since it is larger than the sum of its proper divisors (10551000561004).

21102001122002 is a wasteful number, since it uses less digits than its factorization.

21102001122002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551000561003.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102001122002 its reverse (20022110020112), we get a palindrome (41124111142114).

The spelling of 21102001122002 in words is "twenty-one trillion, one hundred two billion, one million, one hundred twenty-two thousand, two".