21150143454 has 48 divisors (see below), whose sum is σ = 46755394560. Its totient is φ = 6373290000.

The previous prime is 21150143431. The next prime is 21150143473. The reversal of 21150143454 is 45434105112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48579 + ... + 211329.

It is an arithmetic number, because the mean of its divisors is an integer number (974070720).

Almost surely, 2^21150143454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150143454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23377697280).

21150143454 is an abundant number, since it is smaller than the sum of its proper divisors (25605251106).

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

21150143454 is a wasteful number, since it uses less digits than its factorization.

21150143454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162957 (or 162946 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21150143454 its reverse (45434105112), we get a palindrome (66584248566).

The spelling of 21150143454 in words is "twenty-one billion, one hundred fifty million, one hundred forty-three thousand, four hundred fifty-four".