21210101121002 has 4 divisors (see below), whose sum is σ = 31815151681506. Its totient is φ = 10605050560500.

The previous prime is 21210101120993. The next prime is 21210101121047. The reversal of 21210101121002 is 20012110101212.

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., 20787043236961 + 423057884041 = 4559281^2 + 650429^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302525280249 + ... + 5302525280252.

Almost surely, 2^{21210101121002} is an apocalyptic number.

21210101121002 is a deficient number, since it is larger than the sum of its proper divisors (10605050560504).

21210101121002 is a wasteful number, since it uses less digits than its factorization.

21210101121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605050560503.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210101121002 its reverse (20012110101212), we get a palindrome (41222211222214).

The spelling of 21210101121002 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, one hundred twenty-one thousand, two".