1421520778497 has 16 divisors (see below), whose sum is σ = 1986636976128. Its totient is φ = 902412089040.

The previous prime is 1421520778493. The next prime is 1421520778499. The reversal of 1421520778497 is 7948770251241.

It is not a de Polignac number, because 1421520778497 - 2² = 1421520778493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421520778493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46176879 + ... + 46207652.

It is an arithmetic number, because the mean of its divisors is an integer number (124164811008).

Almost surely, 2^{1421520778497} is an apocalyptic number.

It is an amenable number.

1421520778497 is a deficient number, since it is larger than the sum of its proper divisors (565116197631).

1421520778497 is a wasteful number, since it uses less digits than its factorization.

1421520778497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92384780.

The product of its (nonzero) digits is 7902720, while the sum is 57.

The spelling of 1421520778497 in words is "one trillion, four hundred twenty-one billion, five hundred twenty million, seven hundred seventy-eight thousand, four hundred ninety-seven".