1221027939213 has 16 divisors (see below), whose sum is σ = 1685911060800. Its totient is φ = 785139541760.

The previous prime is 1221027939191. The next prime is 1221027939217. The reversal of 1221027939213 is 3129397201221.

It is a cyclic number.

It is not a de Polignac number, because 1221027939213 - 2¹⁰ = 1221027938189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221027939217) 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, 7142508 + ... + 7311461.

It is an arithmetic number, because the mean of its divisors is an integer number (105369441300).

Almost surely, 2^{1221027939213} is an apocalyptic number.

It is an amenable number.

1221027939213 is a deficient number, since it is larger than the sum of its proper divisors (464883121587).

1221027939213 is a wasteful number, since it uses less digits than its factorization.

1221027939213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14454972.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 1221027939213 in words is "one trillion, two hundred twenty-one billion, twenty-seven million, nine hundred thirty-nine thousand, two hundred thirteen".