21020220122002 has 4 divisors (see below), whose sum is σ = 31530330183006. Its totient is φ = 10510110061000.

The previous prime is 21020220121919. The next prime is 21020220122039. The reversal of 21020220122002 is 20022102202012.

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., 17381553236161 + 3638666885841 = 4169119^2 + 1907529^2 .

It is a super-3 number, since 3×21020220122002³ (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, 5255055030499 + ... + 5255055030502.

Almost surely, 2^{21020220122002} is an apocalyptic number.

21020220122002 is a deficient number, since it is larger than the sum of its proper divisors (10510110061004).

21020220122002 is a wasteful number, since it uses less digits than its factorization.

21020220122002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510110061003.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020220122002 its reverse (20022102202012), we get a palindrome (41042322324014).

The spelling of 21020220122002 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-two thousand, two".