21250621345340 has 24 divisors (see below), whose sum is σ = 44626816285632. Its totient is φ = 8500151117120.

The previous prime is 21250621345313. The next prime is 21250621345379. The reversal of 21250621345340 is 4354312605212.

It is a junction number, because it is equal to n+sod(n) for n = 21250621345294 and 21250621345303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4287131 + ... + 7802610.

It is an arithmetic number, because the mean of its divisors is an integer number (1859450678568).

Almost surely, 2^{21250621345340} is an apocalyptic number.

21250621345340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21250621345340 is an abundant number, since it is smaller than the sum of its proper divisors (23376194940292).

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

21250621345340 is a wasteful number, since it uses less digits than its factorization.

21250621345340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12177637 (or 12177635 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 21250621345340 in words is "twenty-one trillion, two hundred fifty billion, six hundred twenty-one million, three hundred forty-five thousand, three hundred forty".