1221020201111 has 8 divisors (see below), whose sum is σ = 1223574184800. Its totient is φ = 1218468711040.

The previous prime is 1221020201083. The next prime is 1221020201179. The reversal of 1221020201111 is 1111020201221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221020201111 is a prime.

It is a super-2 number, since 2×1221020201111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221020201411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358550 + ... + 1603308.

It is an arithmetic number, because the mean of its divisors is an integer number (152946773100).

Almost surely, 2^{1221020201111} is an apocalyptic number.

1221020201111 is a deficient number, since it is larger than the sum of its proper divisors (2553983689).

1221020201111 is a wasteful number, since it uses less digits than its factorization.

1221020201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246809.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221020201111 its reverse (1111020201221), we get a palindrome (2332040402332).

The spelling of 1221020201111 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred one thousand, one hundred eleven".