21402861463830 has 256 divisors, whose sum is σ = 67094370385920. Its totient is φ = 4239646963200.

The previous prime is 21402861463807. The next prime is 21402861463831. The reversal of 21402861463830 is 3836416820412.

It is a self number, because there is not a number n which added to its sum of digits gives 21402861463830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402861463831) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2567416 + ... + 7028324.

It is an arithmetic number, because the mean of its divisors is an integer number (262087384320).

Almost surely, 2^{21402861463830} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21402861463830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33547185192960).

21402861463830 is an abundant number, since it is smaller than the sum of its proper divisors (45691508922090).

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

21402861463830 is a wasteful number, since it uses less digits than its factorization.

21402861463830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461035.

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 21402861463830 in words is "twenty-one trillion, four hundred two billion, eight hundred sixty-one million, four hundred sixty-three thousand, eight hundred thirty".