21054464626 has 16 divisors (see below), whose sum is σ = 34121856384. Its totient is φ = 9685788624.

The previous prime is 21054464611. The next prime is 21054464663. The reversal of 21054464626 is 62646445012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310890 + ... + 1326853.

It is an arithmetic number, because the mean of its divisors is an integer number (2132616024).

Almost surely, 2^21054464626 is an apocalyptic number.

21054464626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21054464626 is a deficient number, since it is larger than the sum of its proper divisors (13067391758).

21054464626 is a wasteful number, since it uses less digits than its factorization.

21054464626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638065.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 21054464626 in words is "twenty-one billion, fifty-four million, four hundred sixty-four thousand, six hundred twenty-six".