21439026946 has 32 divisors (see below), whose sum is σ = 33442523136. Its totient is φ = 10300290000.

The previous prime is 21439026937. The next prime is 21439026949. The reversal of 21439026946 is 64962093412.

It is a junction number, because it is equal to n+sod(n) for n = 21439026896 and 21439026905.

It is not an unprimeable number, because it can be changed into a prime (21439026949) 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, 2994471 + ... + 3001621.

It is an arithmetic number, because the mean of its divisors is an integer number (1045078848).

Almost surely, 2^21439026946 is an apocalyptic number.

21439026946 is a deficient number, since it is larger than the sum of its proper divisors (12003496190).

21439026946 is a wasteful number, since it uses less digits than its factorization.

21439026946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7758.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 21439026946 in words is "twenty-one billion, four hundred thirty-nine million, twenty-six thousand, nine hundred forty-six".