1221153151420 has 12 divisors (see below), whose sum is σ = 2564421618024. Its totient is φ = 488461260560.

The previous prime is 1221153151397. The next prime is 1221153151429. The reversal of 1221153151420 is 241513511221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221153151429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30528828766 + ... + 30528828805.

It is an arithmetic number, because the mean of its divisors is an integer number (213701801502).

Almost surely, 2^{1221153151420} is an apocalyptic number.

1221153151420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221153151420 is an abundant number, since it is smaller than the sum of its proper divisors (1343268466604).

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

1221153151420 is a wasteful number, since it uses less digits than its factorization.

1221153151420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61057657580 (or 61057657578 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1221153151420 its reverse (241513511221), we get a palindrome (1462666662641).

The spelling of 1221153151420 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-three million, one hundred fifty-one thousand, four hundred twenty".