21090417791460 has 96 divisors (see below), whose sum is σ = 59508205206912. Its totient is φ = 5580780840960.

The previous prime is 21090417791389. The next prime is 21090417791479. The reversal of 21090417791460 is 6419771409012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119517454 + ... + 119693786.

It is an arithmetic number, because the mean of its divisors is an integer number (619877137572).

Almost surely, 2^{21090417791460} is an apocalyptic number.

21090417791460 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 21090417791460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29754102603456).

21090417791460 is an abundant number, since it is smaller than the sum of its proper divisors (38417787415452).

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

21090417791460 is a wasteful number, since it uses less digits than its factorization.

21090417791460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191693 (or 191691 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 21090417791460 in words is "twenty-one trillion, ninety billion, four hundred seventeen million, seven hundred ninety-one thousand, four hundred sixty".