1321203122211 has 32 divisors (see below), whose sum is σ = 2041000890880. Its totient is φ = 744572715264.

The previous prime is 1321203122137. The next prime is 1321203122219. The reversal of 1321203122211 is 1122213021231.

It is not a de Polignac number, because 1321203122211 - 2¹⁰ = 1321203121187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1321203122219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26116980 + ... + 26167518.

It is an arithmetic number, because the mean of its divisors is an integer number (63781277840).

Almost surely, 2^{1321203122211} is an apocalyptic number.

1321203122211 is a deficient number, since it is larger than the sum of its proper divisors (719797768669).

1321203122211 is a wasteful number, since it uses less digits than its factorization.

1321203122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67675.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1321203122211 its reverse (1122213021231), we get a palindrome (2443416143442).

The spelling of 1321203122211 in words is "one trillion, three hundred twenty-one billion, two hundred three million, one hundred twenty-two thousand, two hundred eleven".