21370136620140 has 576 divisors, whose sum is σ = 81532320629760. Its totient is φ = 4438018252800.

The previous prime is 21370136620109. The next prime is 21370136620163. The reversal of 21370136620140 is 4102663107312.

21370136620140 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 0 + 13 + 6 + 620 + 14 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21370136620095 and 21370136620104.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4982543116 + ... + 4982547404.

It is an arithmetic number, because the mean of its divisors is an integer number (141549167760).

Almost surely, 2^{21370136620140} is an apocalyptic number.

21370136620140 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 21370136620140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40766160314880).

21370136620140 is an abundant number, since it is smaller than the sum of its proper divisors (60162184009620).

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

21370136620140 is a wasteful number, since it uses less digits than its factorization.

21370136620140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7315 (or 7288 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

Adding to 21370136620140 its reverse (4102663107312), we get a palindrome (25472799727452).

The spelling of 21370136620140 in words is "twenty-one trillion, three hundred seventy billion, one hundred thirty-six million, six hundred twenty thousand, one hundred forty".