21151102530 has 64 divisors (see below), whose sum is σ = 52909129728. Its totient is φ = 5405330880.

The previous prime is 21151102523. The next prime is 21151102541. The reversal of 21151102530 is 3520115112.

It is a junction number, because it is equal to n+sod(n) for n = 21151102497 and 21151102506.

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, 14614 + ... + 206193.

It is an arithmetic number, because the mean of its divisors is an integer number (826705152).

Almost surely, 2^21151102530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21151102530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26454564864).

21151102530 is an abundant number, since it is smaller than the sum of its proper divisors (31758027198).

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

21151102530 is a wasteful number, since it uses less digits than its factorization.

21151102530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220951.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 21151102530 its reverse (3520115112), we get a palindrome (24671217642).

The spelling of 21151102530 in words is "twenty-one billion, one hundred fifty-one million, one hundred two thousand, five hundred thirty".