1213151222520 has 128 divisors (see below), whose sum is σ = 4045303598400. Its totient is φ = 323389698048.

The previous prime is 1213151222519. The next prime is 1213151222561. The reversal of 1213151222520 is 252221513121.

1213151222520 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 15 + 122 + 2 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2796912 + ... + 3201408.

Almost surely, 2^{1213151222520} is an apocalyptic number.

1213151222520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213151222520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2022651799200).

1213151222520 is an abundant number, since it is smaller than the sum of its proper divisors (2832152375880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213151222520 is a wasteful number, since it uses less digits than its factorization.

1213151222520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407294 (or 407284 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1213151222520 its reverse (252221513121), we get a palindrome (1465372735641).

The spelling of 1213151222520 in words is "one trillion, two hundred thirteen billion, one hundred fifty-one million, two hundred twenty-two thousand, five hundred twenty".