21101212220002 has 4 divisors (see below), whose sum is σ = 31651818330006. Its totient is φ = 10550606110000.

The previous prime is 21101212219937. The next prime is 21101212220047. The reversal of 21101212220002 is 20002221210112.

It is a happy number.

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., 15370641732681 + 5730570487321 = 3920541^2 + 2393861^2 .

It is a super-2 number, since 2×21101212220002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275303054999 + ... + 5275303055002.

Almost surely, 2^{21101212220002} is an apocalyptic number.

21101212220002 is a deficient number, since it is larger than the sum of its proper divisors (10550606110004).

21101212220002 is a wasteful number, since it uses less digits than its factorization.

21101212220002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550606110003.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101212220002 its reverse (20002221210112), we get a palindrome (41103433430114).

The spelling of 21101212220002 in words is "twenty-one trillion, one hundred one billion, two hundred twelve million, two hundred twenty thousand, two".