21510052410 has 256 divisors, whose sum is σ = 68272201728. Its totient is φ = 4204569600.

The previous prime is 21510052409. The next prime is 21510052439. The reversal of 21510052410 is 1425001512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3237612 + ... + 3244248.

It is an arithmetic number, because the mean of its divisors is an integer number (266688288).

Almost surely, 2^21510052410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21510052410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34136100864).

21510052410 is an abundant number, since it is smaller than the sum of its proper divisors (46762149318).

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

21510052410 is a wasteful number, since it uses less digits than its factorization.

21510052410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6749.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21510052410 its reverse (1425001512), we get a palindrome (22935053922).

The spelling of 21510052410 in words is "twenty-one billion, five hundred ten million, fifty-two thousand, four hundred ten".