21010221201122 has 4 divisors (see below), whose sum is σ = 31515331801686. Its totient is φ = 10505110600560.

The previous prime is 21010221201071. The next prime is 21010221201143. The reversal of 21010221201122 is 22110212201012.

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., 15271518278641 + 5738702922481 = 3907879^2 + 2395559^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21010221201122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252555300279 + ... + 5252555300282.

Almost surely, 2^{21010221201122} is an apocalyptic number.

21010221201122 is a deficient number, since it is larger than the sum of its proper divisors (10505110600564).

21010221201122 is a wasteful number, since it uses less digits than its factorization.

21010221201122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505110600563.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21010221201122 its reverse (22110212201012), we get a palindrome (43120433402134).

The spelling of 21010221201122 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-two".