21235112054 has 16 divisors (see below), whose sum is σ = 34305305328. Its totient is φ = 9800126112.

The previous prime is 21235112011. The next prime is 21235112071. The reversal of 21235112054 is 45021153212.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 615449 + ... + 649035.

It is an arithmetic number, because the mean of its divisors is an integer number (2144081583).

Almost surely, 2^21235112054 is an apocalyptic number.

21235112054 is a deficient number, since it is larger than the sum of its proper divisors (13070193274).

21235112054 is a wasteful number, since it uses less digits than its factorization.

21235112054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57919.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21235112054 its reverse (45021153212), we get a palindrome (66256265266).

The spelling of 21235112054 in words is "twenty-one billion, two hundred thirty-five million, one hundred twelve thousand, fifty-four".