21010423254 has 32 divisors (see below), whose sum is σ = 42933321216. Its totient is φ = 6851523360.

The previous prime is 21010423253. The next prime is 21010423277. The reversal of 21010423254 is 45232401012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010423253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699024 + ... + 728460.

It is an arithmetic number, because the mean of its divisors is an integer number (1341666288).

Almost surely, 2^21010423254 is an apocalyptic number.

21010423254 is an abundant number, since it is smaller than the sum of its proper divisors (21922897962).

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

21010423254 is a wasteful number, since it uses less digits than its factorization.

21010423254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32020.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21010423254 its reverse (45232401012), we get a palindrome (66242824266).

The spelling of 21010423254 in words is "twenty-one billion, ten million, four hundred twenty-three thousand, two hundred fifty-four".