21452020231554 has 96 divisors (see below), whose sum is σ = 51287880309120. Its totient is φ = 6425893267200.

The previous prime is 21452020231553. The next prime is 21452020231601. The reversal of 21452020231554 is 45513202025412.

21452020231554 is a `hidden beast` number, since 2 + 1 + 4 + 52 + 0 + 20 + 2 + 31 + 554 = 666.

It is not an unprimeable number, because it can be changed into a prime (21452020231553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68163499 + ... + 68477489.

It is an arithmetic number, because the mean of its divisors is an integer number (534248753220).

Almost surely, 2^{21452020231554} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452020231554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25643940154560).

21452020231554 is an abundant number, since it is smaller than the sum of its proper divisors (29835860077566).

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

21452020231554 is a wasteful number, since it uses less digits than its factorization.

21452020231554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317976 (or 317973 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 21452020231554 its reverse (45513202025412), we get a palindrome (66965222256966).

The spelling of 21452020231554 in words is "twenty-one trillion, four hundred fifty-two billion, twenty million, two hundred thirty-one thousand, five hundred fifty-four".