21534645462 has 64 divisors (see below), whose sum is σ = 48021341184. Its totient is φ = 6381885440.

The previous prime is 21534645427. The next prime is 21534645481. The reversal of 21534645462 is 26454643512.

It is a happy number.

It is a congruent number.

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, 6863158 + ... + 6866294.

It is an arithmetic number, because the mean of its divisors is an integer number (750333456).

Almost surely, 2^21534645462 is an apocalyptic number.

21534645462 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21534645462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24010670592).

21534645462 is an abundant number, since it is smaller than the sum of its proper divisors (26486695722).

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

21534645462 is a wasteful number, since it uses less digits than its factorization.

21534645462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5413.

The product of its digits is 691200, while the sum is 42.

The spelling of 21534645462 in words is "twenty-one billion, five hundred thirty-four million, six hundred forty-five thousand, four hundred sixty-two".