21212220212002 has 4 divisors (see below), whose sum is σ = 31818330318006. Its totient is φ = 10606110106000.

The previous prime is 21212220211979. The next prime is 21212220212017. The reversal of 21212220212002 is 20021202221212.

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., 14092283252961 + 7119936959041 = 3753969^2 + 2668321^2 .

It is a super-3 number, since 3×21212220212002³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303055052999 + ... + 5303055053002.

Almost surely, 2^{21212220212002} is an apocalyptic number.

21212220212002 is a deficient number, since it is larger than the sum of its proper divisors (10606110106004).

21212220212002 is a wasteful number, since it uses less digits than its factorization.

21212220212002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606110106003.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21212220212002 its reverse (20021202221212), we get a palindrome (41233422433214).

The spelling of 21212220212002 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred twelve thousand, two".