21253406400430 has 16 divisors (see below), whose sum is σ = 38256204451104. Its totient is φ = 8501346353440.

The previous prime is 21253406400409. The next prime is 21253406400439. The reversal of 21253406400430 is 3400460435212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253406400439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4475559 + ... + 7908061.

It is an arithmetic number, because the mean of its divisors is an integer number (2391012778194).

Almost surely, 2^{21253406400430} is an apocalyptic number.

21253406400430 is a deficient number, since it is larger than the sum of its proper divisors (17002798050674).

21253406400430 is a wasteful number, since it uses less digits than its factorization.

21253406400430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051691.

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 21253406400430 its reverse (3400460435212), we get a palindrome (24653866835642).

The spelling of 21253406400430 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred six million, four hundred thousand, four hundred thirty".