21470654744 has 128 divisors (see below), whose sum is σ = 52569492480. Its totient is φ = 7971532800.

The previous prime is 21470654719. The next prime is 21470654771. The reversal of 21470654744 is 44745607412.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 21470654695 and 21470654704.

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, 3978512 + ... + 3983904.

It is an arithmetic number, because the mean of its divisors is an integer number (410699160).

Almost surely, 2^21470654744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470654744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26284746240).

21470654744 is an abundant number, since it is smaller than the sum of its proper divisors (31098837736).

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

21470654744 is a wasteful number, since it uses less digits than its factorization.

21470654744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721 (or 5717 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 44.

The spelling of 21470654744 in words is "twenty-one billion, four hundred seventy million, six hundred fifty-four thousand, seven hundred forty-four".