21126453510 has 32 divisors (see below), whose sum is σ = 52073855712. Its totient is φ = 5481457920.

The previous prime is 21126453463. The next prime is 21126453521. The reversal of 21126453510 is 1535462112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9515311 + ... + 9517530.

It is an arithmetic number, because the mean of its divisors is an integer number (1627307991).

Almost surely, 2^21126453510 is an apocalyptic number.

21126453510 is an abundant number, since it is smaller than the sum of its proper divisors (30947402202).

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

21126453510 is a wasteful number, since it uses less digits than its factorization.

21126453510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19032888.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21126453510 in words is "twenty-one billion, one hundred twenty-six million, four hundred fifty-three thousand, five hundred ten".