1221021314111 has 16 divisors (see below), whose sum is σ = 1295182656864. Its totient is φ = 1147120579584.

The previous prime is 1221021314057. The next prime is 1221021314113. The reversal of 1221021314111 is 1114131201221.

It is a happy number.

It is not a de Polignac number, because 1221021314111 - 2²² = 1221017119807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021314113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46799876 + ... + 46825958.

It is an arithmetic number, because the mean of its divisors is an integer number (80948916054).

Almost surely, 2^{1221021314111} is an apocalyptic number.

1221021314111 is a deficient number, since it is larger than the sum of its proper divisors (74161342753).

1221021314111 is a wasteful number, since it uses less digits than its factorization.

1221021314111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30970.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1221021314111 its reverse (1114131201221), we get a palindrome (2335152515332).

The spelling of 1221021314111 in words is "one trillion, two hundred twenty-one billion, twenty-one million, three hundred fourteen thousand, one hundred eleven".