21111035254 has 16 divisors (see below), whose sum is σ = 33046483680. Its totient is φ = 10095627520.

The previous prime is 21111035249. The next prime is 21111035291. The reversal of 21111035254 is 45253011112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827814 + ... + 852934.

It is an arithmetic number, because the mean of its divisors is an integer number (2065405230).

Almost surely, 2^21111035254 is an apocalyptic number.

21111035254 is a deficient number, since it is larger than the sum of its proper divisors (11935448426).

21111035254 is a wasteful number, since it uses less digits than its factorization.

21111035254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43415.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21111035254 its reverse (45253011112), we get a palindrome (66364046366).

The spelling of 21111035254 in words is "twenty-one billion, one hundred eleven million, thirty-five thousand, two hundred fifty-four".