21240098177980 has 96 divisors (see below), whose sum is σ = 48815148856320. Its totient is φ = 7698938016000.

The previous prime is 21240098177959. The next prime is 21240098178001. The reversal of 21240098177980 is 8977189004212.

It is an interprime number because it is at equal distance from previous prime (21240098177959) and next prime (21240098178001).

It is a super-2 number, since 2×21240098177980² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 113379990 + ... + 113567170.

It is an arithmetic number, because the mean of its divisors is an integer number (508491133920).

Almost surely, 2^{21240098177980} is an apocalyptic number.

21240098177980 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 21240098177980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24407574428160).

21240098177980 is an abundant number, since it is smaller than the sum of its proper divisors (27575050678340).

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

21240098177980 is a wasteful number, since it uses less digits than its factorization.

21240098177980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188851 (or 188849 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 21240098177980 in words is "twenty-one trillion, two hundred forty billion, ninety-eight million, one hundred seventy-seven thousand, nine hundred eighty".