221020000020122 has 4 divisors (see below), whose sum is σ = 331530000030186. Its totient is φ = 110510000010060.

The previous prime is 221020000020097. The next prime is 221020000020137.

221020000020122 is nontrivially palindromic in base 10.

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., 123143386806001 + 97876613214121 = 11096999^2 + 9893261^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221020000020097 and 221020000020106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55255000005029 + ... + 55255000005032.

Almost surely, 2^{221020000020122} is an apocalyptic number.

221020000020122 is a deficient number, since it is larger than the sum of its proper divisors (110510000010064).

221020000020122 is a wasteful number, since it uses less digits than its factorization.

221020000020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110510000010063.

The product of its (nonzero) digits is 64, while the sum is 14.

It can be divided in two parts, 2210200000 and 20122, that added together give a palindrome (2210220122).

The spelling of 221020000020122 in words is "two hundred twenty-one trillion, twenty billion, twenty thousand, one hundred twenty-two".