21023252454354 has 32 divisors (see below), whose sum is σ = 42078626029440. Its totient is φ = 7002398614272.

The previous prime is 21023252454317. The next prime is 21023252454371. The reversal of 21023252454354 is 45345425232012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65381827 + ... + 65702585.

It is an arithmetic number, because the mean of its divisors is an integer number (1314957063420).

Almost surely, 2^{21023252454354} is an apocalyptic number.

21023252454354 is an abundant number, since it is smaller than the sum of its proper divisors (21055373575086).

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

21023252454354 is a wasteful number, since it uses less digits than its factorization.

21023252454354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329074.

The product of its (nonzero) digits is 1152000, while the sum is 42.

Adding to 21023252454354 its reverse (45345425232012), we get a palindrome (66368677686366).

The spelling of 21023252454354 in words is "twenty-one trillion, twenty-three billion, two hundred fifty-two million, four hundred fifty-four thousand, three hundred fifty-four".