1221513223151 has 8 divisors (see below), whose sum is σ = 1325517580464. Its totient is φ = 1118943408960.

The previous prime is 1221513223121. The next prime is 1221513223169. The reversal of 1221513223151 is 1513223151221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1221513223151 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 (1221513223111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358634006 + ... + 358637411.

It is an arithmetic number, because the mean of its divisors is an integer number (165689697558).

Almost surely, 2^{1221513223151} is an apocalyptic number.

1221513223151 is a deficient number, since it is larger than the sum of its proper divisors (104004357313).

1221513223151 is a wasteful number, since it uses less digits than its factorization.

1221513223151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717271561.

The product of its digits is 3600, while the sum is 29.

Adding to 1221513223151 its reverse (1513223151221), we get a palindrome (2734736374372).

The spelling of 1221513223151 in words is "one trillion, two hundred twenty-one billion, five hundred thirteen million, two hundred twenty-three thousand, one hundred fifty-one".