21447078374 has 4 divisors (see below), whose sum is σ = 32170617564. Its totient is φ = 10723539186.

The previous prime is 21447078371. The next prime is 21447078407. The reversal of 21447078374 is 47387074412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447078371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361769592 + ... + 5361769595.

It is an arithmetic number, because the mean of its divisors is an integer number (8042654391).

Almost surely, 2^21447078374 is an apocalyptic number.

21447078374 is a deficient number, since it is larger than the sum of its proper divisors (10723539190).

21447078374 is a wasteful number, since it uses less digits than its factorization.

21447078374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10723539189.

The product of its (nonzero) digits is 1053696, while the sum is 47.

The spelling of 21447078374 in words is "twenty-one billion, four hundred forty-seven million, seventy-eight thousand, three hundred seventy-four".