21034451114520 has 128 divisors (see below), whose sum is σ = 64069042487040. Its totient is φ = 5523410280960.

The previous prime is 21034451114507. The next prime is 21034451114533. The reversal of 21034451114520 is 2541115443012.

It is an interprime number because it is at equal distance from previous prime (21034451114507) and next prime (21034451114533).

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, 21165975 + ... + 22137465.

It is an arithmetic number, because the mean of its divisors is an integer number (500539394430).

Almost surely, 2^{21034451114520} is an apocalyptic number.

21034451114520 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 21034451114520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32034521243520).

21034451114520 is an abundant number, since it is smaller than the sum of its proper divisors (43034591372520).

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

21034451114520 is a wasteful number, since it uses less digits than its factorization.

21034451114520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974265 (or 974261 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21034451114520 its reverse (2541115443012), we get a palindrome (23575566557532).

The spelling of 21034451114520 in words is "twenty-one trillion, thirty-four billion, four hundred fifty-one million, one hundred fourteen thousand, five hundred twenty".