1247640467421 has 64 divisors (see below), whose sum is σ = 1858034769920. Its totient is φ = 741306919680.

The previous prime is 1247640467417. The next prime is 1247640467431.

1247640467421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1247640467421 - 2² = 1247640467417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247640467431) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80866110 + ... + 80881536.

It is an arithmetic number, because the mean of its divisors is an integer number (29031793280).

Almost surely, 2^{1247640467421} is an apocalyptic number.

It is an amenable number.

1247640467421 is a deficient number, since it is larger than the sum of its proper divisors (610394302499).

1247640467421 is a wasteful number, since it uses less digits than its factorization.

1247640467421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16754.

The product of its (nonzero) digits is 1806336, while the sum is 48.

The spelling of 1247640467421 in words is "one trillion, two hundred forty-seven billion, six hundred forty million, four hundred sixty-seven thousand, four hundred twenty-one".