1421509781747 has 4 divisors (see below), whose sum is σ = 1550737943736. Its totient is φ = 1292281619760.

The previous prime is 1421509781711. The next prime is 1421509781771. The reversal of 1421509781747 is 7471879051241.

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 1421509781747 - 2³⁴ = 1404329912563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421509781692 and 1421509781701.

It is not an unprimeable number, because it can be changed into a prime (1421509781647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64614080978 + ... + 64614080999.

It is an arithmetic number, because the mean of its divisors is an integer number (387684485934).

Almost surely, 2^{1421509781747} is an apocalyptic number.

1421509781747 is a deficient number, since it is larger than the sum of its proper divisors (129228161989).

1421509781747 is a wasteful number, since it uses less digits than its factorization.

1421509781747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129228161988.

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 1421509781747 in words is "one trillion, four hundred twenty-one billion, five hundred nine million, seven hundred eighty-one thousand, seven hundred forty-seven".