21641051051620 has 384 divisors, whose sum is σ = 63008453394432. Its totient is φ = 6023495577600.

The previous prime is 21641051051579. The next prime is 21641051051639. The reversal of 21641051051620 is 2615015014612.

It is a super-3 number, since 3×21641051051620³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3343276704 + ... + 3343283176.

It is an arithmetic number, because the mean of its divisors is an integer number (164084514048).

Almost surely, 2^{21641051051620} is an apocalyptic number.

21641051051620 is a gapful number since it is divisible by the number (20) 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 21641051051620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31504226697216).

21641051051620 is an abundant number, since it is smaller than the sum of its proper divisors (41367402342812).

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

21641051051620 is a wasteful number, since it uses less digits than its factorization.

21641051051620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11931 (or 11929 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 21641051051620 in words is "twenty-one trillion, six hundred forty-one billion, fifty-one million, fifty-one thousand, six hundred twenty".