21305250454 has 16 divisors (see below), whose sum is σ = 32200150320. Its totient is φ = 10572055200.

The previous prime is 21305250431. The next prime is 21305250467. The reversal of 21305250454 is 45405250312.

It is a super-2 number, since 2×21305250454² (a number of 21 digits) contains 22 as substring.

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, 181912 + ... + 275140.

It is an arithmetic number, because the mean of its divisors is an integer number (2012509395).

Almost surely, 2^21305250454 is an apocalyptic number.

21305250454 is a deficient number, since it is larger than the sum of its proper divisors (10894899866).

21305250454 is a wasteful number, since it uses less digits than its factorization.

21305250454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94095.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 21305250454 in words is "twenty-one billion, three hundred five million, two hundred fifty thousand, four hundred fifty-four".