21057962020452 has 288 divisors, whose sum is σ = 64911858278400. Its totient is φ = 5883783990336.

The previous prime is 21057962020421. The next prime is 21057962020561. The reversal of 21057962020452 is 25402026975012.

21057962020452 is a `hidden beast` number, since 2 + 1 + 0 + 579 + 6 + 2 + 0 + 20 + 4 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21057962020398 and 21057962020407.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 313109893 + ... + 313177139.

It is an arithmetic number, because the mean of its divisors is an integer number (225388396800).

Almost surely, 2^{21057962020452} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21057962020452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32455929139200).

21057962020452 is an abundant number, since it is smaller than the sum of its proper divisors (43853896257948).

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

21057962020452 is a wasteful number, since it uses less digits than its factorization.

21057962020452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68580 (or 68565 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

Adding to 21057962020452 its reverse (25402026975012), we get a palindrome (46459988995464).

The spelling of 21057962020452 in words is "twenty-one trillion, fifty-seven billion, nine hundred sixty-two million, twenty thousand, four hundred fifty-two".