21890140405602 has 48 divisors (see below), whose sum is σ = 50928455276640. Its totient is φ = 6254279959872.

The previous prime is 21890140405597. The next prime is 21890140405633. The reversal of 21890140405602 is 20650404109812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77289133 + ... + 77571839.

It is an arithmetic number, because the mean of its divisors is an integer number (1061009484930).

Almost surely, 2^{21890140405602} is an apocalyptic number.

21890140405602 is an abundant number, since it is smaller than the sum of its proper divisors (29038314871038).

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

21890140405602 is a wasteful number, since it uses less digits than its factorization.

21890140405602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546095 (or 546088 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 21890140405602 in words is "twenty-one trillion, eight hundred ninety billion, one hundred forty million, four hundred five thousand, six hundred two".