1221211515068 has 6 divisors (see below), whose sum is σ = 2137120151376. Its totient is φ = 610605757532.

The previous prime is 1221211515061. The next prime is 1221211515091. The reversal of 1221211515068 is 8605151121221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211515061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152651439380 + ... + 152651439387.

It is an arithmetic number, because the mean of its divisors is an integer number (356186691896).

Almost surely, 2^{1221211515068} is an apocalyptic number.

It is an amenable number.

1221211515068 is a deficient number, since it is larger than the sum of its proper divisors (915908636308).

1221211515068 is a wasteful number, since it uses less digits than its factorization.

1221211515068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305302878771 (or 305302878769 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 35.

Adding to 1221211515068 its reverse (8605151121221), we get a palindrome (9826362636289).

The spelling of 1221211515068 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, five hundred fifteen thousand, sixty-eight".