21121021200002 has 8 divisors (see below), whose sum is σ = 31701932018316. Its totient is φ = 10553710527232.

The previous prime is 21121021199983. The next prime is 21121021200011. The reversal of 21121021200002 is 20000212012112.

It can be written as a sum of positive squares in 2 ways, for example, as 20757218008081 + 363803191921 = 4556009^2 + 603161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21121021200002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400032503 + ... + 3400038714.

Almost surely, 2^{21121021200002} is an apocalyptic number.

21121021200002 is a deficient number, since it is larger than the sum of its proper divisors (10580910818314).

21121021200002 is a wasteful number, since it uses less digits than its factorization.

21121021200002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800072772.

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

Adding to 21121021200002 its reverse (20000212012112), we get a palindrome (41121233212114).

The spelling of 21121021200002 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred thousand, two".