21122068254 has 64 divisors (see below), whose sum is σ = 49505402880. Its totient is φ = 5883333120.

The previous prime is 21122068237. The next prime is 21122068321. The reversal of 21122068254 is 45286022112.

It is a super-2 number, since 2×21122068254² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253027 + ... + 325985.

It is an arithmetic number, because the mean of its divisors is an integer number (773521920).

Almost surely, 2^21122068254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122068254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24752701440).

21122068254 is an abundant number, since it is smaller than the sum of its proper divisors (28383334626).

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

21122068254 is a wasteful number, since it uses less digits than its factorization.

21122068254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73145.

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 21122068254 in words is "twenty-one billion, one hundred twenty-two million, sixty-eight thousand, two hundred fifty-four".