21251402466348 has 192 divisors, whose sum is σ = 53297575575552. Its totient is φ = 6574749941760.

The previous prime is 21251402466251. The next prime is 21251402466353. The reversal of 21251402466348 is 84366420415212.

It is a junction number, because it is equal to n+sod(n) for n = 21251402466297 and 21251402466306.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1976317740 + ... + 1976328492.

It is an arithmetic number, because the mean of its divisors is an integer number (277591539456).

Almost surely, 2^{21251402466348} 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 21251402466348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26648787787776).

21251402466348 is an abundant number, since it is smaller than the sum of its proper divisors (32046173109204).

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

21251402466348 is a wasteful number, since it uses less digits than its factorization.

21251402466348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12124 (or 12122 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 21251402466348 in words is "twenty-one trillion, two hundred fifty-one billion, four hundred two million, four hundred sixty-six thousand, three hundred forty-eight".