21354661010364 has 96 divisors (see below), whose sum is σ = 54901729639680. Its totient is φ = 6406397568000.

The previous prime is 21354661010351. The next prime is 21354661010369. The reversal of 21354661010364 is 46301016645312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354661010369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16662087 + ... + 17897889.

It is an arithmetic number, because the mean of its divisors is an integer number (571893017080).

Almost surely, 2^{21354661010364} 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 21354661010364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27450864819840).

21354661010364 is an abundant number, since it is smaller than the sum of its proper divisors (33547068629316).

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

21354661010364 is a wasteful number, since it uses less digits than its factorization.

21354661010364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237131 (or 1237129 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 21354661010364 its reverse (46301016645312), we get a palindrome (67655677655676).

The spelling of 21354661010364 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-one million, ten thousand, three hundred sixty-four".