21112510254 has 32 divisors (see below), whose sum is σ = 46092309120. Its totient is φ = 6393751200.

The previous prime is 21112510253. The next prime is 21112510271. The reversal of 21112510254 is 45201521112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112510253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8317 + ... + 205655.

It is an arithmetic number, because the mean of its divisors is an integer number (1440384660).

Almost surely, 2^21112510254 is an apocalyptic number.

21112510254 is an abundant number, since it is smaller than the sum of its proper divisors (24979798866).

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

21112510254 is a wasteful number, since it uses less digits than its factorization.

21112510254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198976.

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

The spelling of 21112510254 in words is "twenty-one billion, one hundred twelve million, five hundred ten thousand, two hundred fifty-four".