21293147739 has 16 divisors (see below), whose sum is σ = 29005875360. Its totient is φ = 13891215360.

The previous prime is 21293147699. The next prime is 21293147789. The reversal of 21293147739 is 93774139212.

It is not a de Polignac number, because 21293147739 - 2⁷ = 21293147611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21293147789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385182 + ... + 436979.

It is an arithmetic number, because the mean of its divisors is an integer number (1812867210).

Almost surely, 2^21293147739 is an apocalyptic number.

21293147739 is a deficient number, since it is larger than the sum of its proper divisors (7712727621).

21293147739 is an equidigital number, since it uses as much as digits as its factorization.

21293147739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822350.

The product of its digits is 571536, while the sum is 48.

The spelling of 21293147739 in words is "twenty-one billion, two hundred ninety-three million, one hundred forty-seven thousand, seven hundred thirty-nine".