21106513254 has 16 divisors (see below), whose sum is σ = 42905044080.
Its totient is φ = 6920168160.
The previous prime is 21106513237. The next prime is 21106513271. The reversal of 21106513254 is 45231560112.
It is an interprime number because it is at equal distance from previous prime (21106513237) and next prime (21106513271).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28833669 + ... + 28834400.
It is an arithmetic number, because the mean of its divisors is an integer number (2681565255).
Almost surely, 221106513254 is an apocalyptic number.
21106513254 is an abundant number, since it is smaller than the sum of its proper divisors (21798530826).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21106513254 is a wasteful number, since it uses less digits than its factorization.
21106513254 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57668135.
The product of its (nonzero) digits is 7200, while the sum is 30.
The spelling of 21106513254 in words is "twenty-one billion, one hundred six million, five hundred thirteen thousand, two hundred fifty-four".