21451074708 has 144 divisors (see below), whose sum is σ = 63965242880. Its totient is φ = 5464641024.

The previous prime is 21451074707. The next prime is 21451074709. The reversal of 21451074708 is 80747015412.

It is an interprime number because it is at equal distance from previous prime (21451074707) and next prime (21451074709).

It is a super-2 number, since 2×21451074708² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451074707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 437991 + ... + 484497.

Almost surely, 2^21451074708 is an apocalyptic number.

21451074708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21451074708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31982621440).

21451074708 is an abundant number, since it is smaller than the sum of its proper divisors (42514168172).

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

21451074708 is a wasteful number, since it uses less digits than its factorization.

21451074708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46574 (or 46555 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The spelling of 21451074708 in words is "twenty-one billion, four hundred fifty-one million, seventy-four thousand, seven hundred eight".