21025123054 has 16 divisors (see below), whose sum is σ = 33966399600. Its totient is φ = 9703120320.

The previous prime is 21025123051. The next prime is 21025123057. The reversal of 21025123054 is 45032152012.

It is an interprime number because it is at equal distance from previous prime (21025123051) and next prime (21025123057).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025123051) 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, 408589 + ... + 457159.

It is an arithmetic number, because the mean of its divisors is an integer number (2122899975).

Almost surely, 2^21025123054 is an apocalyptic number.

21025123054 is a deficient number, since it is larger than the sum of its proper divisors (12941276546).

21025123054 is a wasteful number, since it uses less digits than its factorization.

21025123054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65235.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21025123054 its reverse (45032152012), we get a palindrome (66057275066).

The spelling of 21025123054 in words is "twenty-one billion, twenty-five million, one hundred twenty-three thousand, fifty-four".