1221154105234 has 16 divisors (see below), whose sum is σ = 2093469840000. Its totient is φ = 523336058784.

The previous prime is 1221154105201. The next prime is 1221154105271. The reversal of 1221154105234 is 4325014511221.

It is a super-2 number, since 2×1221154105234² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221154105196 and 1221154105205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818734 + ... + 1764265.

It is an arithmetic number, because the mean of its divisors is an integer number (130841865000).

Almost surely, 2^{1221154105234} is an apocalyptic number.

1221154105234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221154105234 is a deficient number, since it is larger than the sum of its proper divisors (872315734766).

1221154105234 is a wasteful number, since it uses less digits than its factorization.

1221154105234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616777.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 1221154105234 its reverse (4325014511221), we get a palindrome (5546168616455).

The spelling of 1221154105234 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-four million, one hundred five thousand, two hundred thirty-four".