21355414165734 has 64 divisors (see below), whose sum is σ = 47710717452288. Its totient is φ = 6316398295200.

The previous prime is 21355414165727. The next prime is 21355414165751. The reversal of 21355414165734 is 43756141455312.

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, 1394479 + ... + 6682469.

It is an arithmetic number, because the mean of its divisors is an integer number (745479960192).

Almost surely, 2^{21355414165734} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21355414165734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23855358726144).

21355414165734 is an abundant number, since it is smaller than the sum of its proper divisors (26355303286554).

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

21355414165734 is a wasteful number, since it uses less digits than its factorization.

21355414165734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5289473.

The product of its digits is 6048000, while the sum is 51.

The spelling of 21355414165734 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fourteen million, one hundred sixty-five thousand, seven hundred thirty-four".