21141836680 has 16 divisors (see below), whose sum is σ = 47569132620. Its totient is φ = 8456734656.

The previous prime is 21141836659. The next prime is 21141836689. The reversal of 21141836680 is 8663814112.

It can be written as a sum of positive squares in 2 ways, for example, as 18532465956 + 2609370724 = 136134^2 + 51082^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 528545917 = 21141836680 / (2 + 1 + 1 + 4 + 1 + 8 + 3 + 6 + 6 + 8 + 0).

It is not an unprimeable number, because it can be changed into a prime (21141836689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264272919 + ... + 264272998.

Almost surely, 2^21141836680 is an apocalyptic number.

21141836680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21141836680 is an abundant number, since it is smaller than the sum of its proper divisors (26427295940).

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

21141836680 is a wasteful number, since it uses less digits than its factorization.

21141836680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528545928 (or 528545924 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21141836680 in words is "twenty-one billion, one hundred forty-one million, eight hundred thirty-six thousand, six hundred eighty".