21454051254 has 16 divisors (see below), whose sum is σ = 42916884480. Its totient is φ = 7149886760.

The previous prime is 21454051243. The next prime is 21454051273. The reversal of 21454051254 is 45215045412.

It is a happy number.

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, 333942 + ... + 392969.

It is an arithmetic number, because the mean of its divisors is an integer number (2682305280).

Almost surely, 2^21454051254 is an apocalyptic number.

21454051254 is an abundant number, since it is smaller than the sum of its proper divisors (21462833226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454051254 is a wasteful number, since it uses less digits than its factorization.

21454051254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731835.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 21454051254 its reverse (45215045412), we get a palindrome (66669096666).

The spelling of 21454051254 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, two hundred fifty-four".