21125211054 has 16 divisors (see below), whose sum is σ = 43232990592. Its totient is φ = 6877975608.

The previous prime is 21125211049. The next prime is 21125211059. The reversal of 21125211054 is 45011252112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21125211049) and next prime (21125211059).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125211059) 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, 40940074 + ... + 40940589.

It is an arithmetic number, because the mean of its divisors is an integer number (2702061912).

Almost surely, 2^21125211054 is an apocalyptic number.

21125211054 is an abundant number, since it is smaller than the sum of its proper divisors (22107779538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21125211054 is a wasteful number, since it uses less digits than its factorization.

21125211054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81880711.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21125211054 its reverse (45011252112), we get a palindrome (66136463166).

The spelling of 21125211054 in words is "twenty-one billion, one hundred twenty-five million, two hundred eleven thousand, fifty-four".