1221724342135 has 16 divisors (see below), whose sum is σ = 1683524453760. Its totient is φ = 841762225440.

The previous prime is 1221724342079. The next prime is 1221724342159. The reversal of 1221724342135 is 5312434271221.

It is not a de Polignac number, because 1221724342135 - 2²³ = 1221715953527 is a prime.

It is a super-2 number, since 2×1221724342135² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221724342094 and 1221724342103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 584556057 + ... + 584558146.

It is an arithmetic number, because the mean of its divisors is an integer number (105220278360).

Almost surely, 2^{1221724342135} is an apocalyptic number.

1221724342135 is a deficient number, since it is larger than the sum of its proper divisors (461800111625).

1221724342135 is a wasteful number, since it uses less digits than its factorization.

1221724342135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169114238.

The product of its digits is 80640, while the sum is 37.

The spelling of 1221724342135 in words is "one trillion, two hundred twenty-one billion, seven hundred twenty-four million, three hundred forty-two thousand, one hundred thirty-five".