1221042143101 has 12 divisors (see below), whose sum is σ = 1351933872156. Its totient is φ = 1101935827520.

The previous prime is 1221042143081. The next prime is 1221042143119. The reversal of 1221042143101 is 1013412401221.

It can be written as a sum of positive squares in 2 ways, for example, as 1052163062500 + 168879080601 = 1025750^2 + 410949^2 .

It is not a de Polignac number, because 1221042143101 - 2¹⁹ = 1221041618813 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 (1221042143131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36812830 + ... + 36845983.

It is an arithmetic number, because the mean of its divisors is an integer number (112661156013).

Almost surely, 2^{1221042143101} is an apocalyptic number.

1221042143101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221042143101 is a deficient number, since it is larger than the sum of its proper divisors (130891729055).

1221042143101 is a wasteful number, since it uses less digits than its factorization.

1221042143101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73658972 (or 73658961 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1221042143101 its reverse (1013412401221), we get a palindrome (2234454544322).

The spelling of 1221042143101 in words is "one trillion, two hundred twenty-one billion, forty-two million, one hundred forty-three thousand, one hundred one".