1221021010311 has 8 divisors (see below), whose sum is σ = 1628746164864. Its totient is φ = 813654931320.

The previous prime is 1221021010309. The next prime is 1221021010381. The reversal of 1221021010311 is 1130101201221.

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

It is not a de Polignac number, because 1221021010311 - 2¹ = 1221021010309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021010381) 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, 89760955 + ... + 89774556.

It is an arithmetic number, because the mean of its divisors is an integer number (203593270608).

Almost surely, 2^{1221021010311} is an apocalyptic number.

1221021010311 is a deficient number, since it is larger than the sum of its proper divisors (407725154553).

1221021010311 is a wasteful number, since it uses less digits than its factorization.

1221021010311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179537781.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1221021010311 its reverse (1130101201221), we get a palindrome (2351122211532).

The spelling of 1221021010311 in words is "one trillion, two hundred twenty-one billion, twenty-one million, ten thousand, three hundred eleven".