21250640054 has 16 divisors (see below), whose sum is σ = 37318198176. Its totient is φ = 8885284800.

The previous prime is 21250640053. The next prime is 21250640071. The reversal of 21250640054 is 45004605212.

It is a junction number, because it is equal to n+sod(n) for n = 21250639999 and 21250640026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250640053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18510437 + ... + 18511584.

It is an arithmetic number, because the mean of its divisors is an integer number (2332387386).

Almost surely, 2^21250640054 is an apocalyptic number.

21250640054 is a deficient number, since it is larger than the sum of its proper divisors (16067558122).

21250640054 is a wasteful number, since it uses less digits than its factorization.

21250640054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37022071.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21250640054 in words is "twenty-one billion, two hundred fifty million, six hundred forty thousand, fifty-four".