1221505142431 has 8 divisors (see below), whose sum is σ = 1397311784480. Its totient is φ = 1046024977248.

The previous prime is 1221505142411. The next prime is 1221505142447. The reversal of 1221505142431 is 1342415051221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221505142431 - 2⁵ = 1221505142399 is a prime.

It is a super-2 number, since 2×1221505142431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221505142393 and 1221505142402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221505142411) 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, 81611196 + ... + 81626161.

It is an arithmetic number, because the mean of its divisors is an integer number (174663973060).

Almost surely, 2^{1221505142431} is an apocalyptic number.

1221505142431 is a deficient number, since it is larger than the sum of its proper divisors (175806642049).

1221505142431 is a wasteful number, since it uses less digits than its factorization.

1221505142431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163238433.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 1221505142431 in words is "one trillion, two hundred twenty-one billion, five hundred five million, one hundred forty-two thousand, four hundred thirty-one".