21365147254 has 16 divisors (see below), whose sum is σ = 34971765696. Its totient is φ = 9708481800.

The previous prime is 21365147233. The next prime is 21365147261. The reversal of 21365147254 is 45274156312.

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, 72492 + ... + 219055.

It is an arithmetic number, because the mean of its divisors is an integer number (2185735356).

Almost surely, 2^21365147254 is an apocalyptic number.

21365147254 is a deficient number, since it is larger than the sum of its proper divisors (13606618442).

21365147254 is a wasteful number, since it uses less digits than its factorization.

21365147254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294891.

The product of its digits is 201600, while the sum is 40.

The spelling of 21365147254 in words is "twenty-one billion, three hundred sixty-five million, one hundred forty-seven thousand, two hundred fifty-four".