1421516437897 has 4 divisors (see below), whose sum is σ = 1424005959376. Its totient is φ = 1419026916420.

The previous prime is 1421516437811. The next prime is 1421516437903. The reversal of 1421516437897 is 7987346151241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1421516437897 - 2²⁷ = 1421382220169 is a prime.

It is a super-2 number, since 2×1421516437897² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421516437097) 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, 1244759883 + ... + 1244761024.

It is an arithmetic number, because the mean of its divisors is an integer number (356001489844).

Almost surely, 2^{1421516437897} is an apocalyptic number.

It is an amenable number.

1421516437897 is a deficient number, since it is larger than the sum of its proper divisors (2489521479).

1421516437897 is an equidigital number, since it uses as much as digits as its factorization.

1421516437897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489521478.

The product of its digits is 10160640, while the sum is 58.

The spelling of 1421516437897 in words is "one trillion, four hundred twenty-one billion, five hundred sixteen million, four hundred thirty-seven thousand, eight hundred ninety-seven".