921894949079 has 4 divisors (see below), whose sum is σ = 992809945176. Its totient is φ = 850979952984.

The previous prime is 921894949007. The next prime is 921894949091. The reversal of 921894949079 is 970949498129.

921894949079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970949498129 = 13 ⋅74688422933.

It is a cyclic number.

It is not a de Polignac number, because 921894949079 - 2¹² = 921894944983 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 (921894942079) 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, 35457498029 + ... + 35457498054.

It is an arithmetic number, because the mean of its divisors is an integer number (248202486294).

Almost surely, 2^921894949079 is an apocalyptic number.

921894949079 is a deficient number, since it is larger than the sum of its proper divisors (70914996097).

921894949079 is a wasteful number, since it uses less digits than its factorization.

921894949079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70914996096.

The product of its (nonzero) digits is 105815808, while the sum is 71.

The spelling of 921894949079 in words is "nine hundred twenty-one billion, eight hundred ninety-four million, nine hundred forty-nine thousand, seventy-nine".