21970273487 has 4 divisors (see below), whose sum is σ = 22164700800. Its totient is φ = 21775846176.

The previous prime is 21970273447. The next prime is 21970273519. The reversal of 21970273487 is 78437207912.

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 21970273487 - 2²⁰ = 21969224911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970273447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97213487 + ... + 97213712.

It is an arithmetic number, because the mean of its divisors is an integer number (5541175200).

Almost surely, 2^21970273487 is an apocalyptic number.

21970273487 is a deficient number, since it is larger than the sum of its proper divisors (194427313).

21970273487 is a wasteful number, since it uses less digits than its factorization.

21970273487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194427312.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 21970273487 in words is "twenty-one billion, nine hundred seventy million, two hundred seventy-three thousand, four hundred eighty-seven".