21351255230 has 32 divisors (see below), whose sum is σ = 40701364704. Its totient is φ = 8036463616.

The previous prime is 21351255229. The next prime is 21351255251. The reversal of 21351255230 is 3255215312.

It is a junction number, because it is equal to n+sod(n) for n = 21351255193 and 21351255202.

It is a congruent number.

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, 1090709 + ... + 1110111.

It is an arithmetic number, because the mean of its divisors is an integer number (1271917647).

Almost surely, 2^21351255230 is an apocalyptic number.

21351255230 is a deficient number, since it is larger than the sum of its proper divisors (19350109474).

21351255230 is a wasteful number, since it uses less digits than its factorization.

21351255230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25900.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21351255230 in words is "twenty-one billion, three hundred fifty-one million, two hundred fifty-five thousand, two hundred thirty".