1221214024351 has 4 divisors (see below), whose sum is σ = 1250999732304. Its totient is φ = 1191428316400.

The previous prime is 1221214024333. The next prime is 1221214024357. The reversal of 1221214024351 is 1534204121221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221214024351 - 2⁷ = 1221214024223 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 (1221214024357) 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, 14892853915 + ... + 14892853996.

It is an arithmetic number, because the mean of its divisors is an integer number (312749933076).

Almost surely, 2^{1221214024351} is an apocalyptic number.

1221214024351 is a deficient number, since it is larger than the sum of its proper divisors (29785707953).

1221214024351 is an equidigital number, since it uses as much as digits as its factorization.

1221214024351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29785707952.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 1221214024351 its reverse (1534204121221), we get a palindrome (2755418145572).

The spelling of 1221214024351 in words is "one trillion, two hundred twenty-one billion, two hundred fourteen million, twenty-four thousand, three hundred fifty-one".