21701378040552 has 192 divisors, whose sum is σ = 70828803427200. Its totient is φ = 5863875379200.

The previous prime is 21701378040541. The next prime is 21701378040581. The reversal of 21701378040552 is 25504087310712.

21701378040552 is a `hidden beast` number, since 2 + 1 + 7 + 0 + 13 + 7 + 80 + 4 + 0 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21701378040498 and 21701378040507.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3561552 + ... + 7489152.

It is an arithmetic number, because the mean of its divisors is an integer number (368900017850).

Almost surely, 2^{21701378040552} 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 21701378040552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35414401713600).

21701378040552 is an abundant number, since it is smaller than the sum of its proper divisors (49127425386648).

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

21701378040552 is a wasteful number, since it uses less digits than its factorization.

21701378040552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928216 (or 3928209 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 21701378040552 in words is "twenty-one trillion, seven hundred one billion, three hundred seventy-eight million, forty thousand, five hundred fifty-two".