1221023500351 has 8 divisors (see below), whose sum is σ = 1249577162064. Its totient is φ = 1192477009920.

The previous prime is 1221023500337. The next prime is 1221023500469. The reversal of 1221023500351 is 1530053201221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221023500351 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 (1221023500321) 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, 1447540 + ... + 2130121.

It is an arithmetic number, because the mean of its divisors is an integer number (156197145258).

Almost surely, 2^{1221023500351} is an apocalyptic number.

1221023500351 is a deficient number, since it is larger than the sum of its proper divisors (28553661713).

1221023500351 is an equidigital number, since it uses as much as digits as its factorization.

1221023500351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585641.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 1221023500351 its reverse (1530053201221), we get a palindrome (2751076701572).

The spelling of 1221023500351 in words is "one trillion, two hundred twenty-one billion, twenty-three million, five hundred thousand, three hundred fifty-one".