21340916254 has 16 divisors (see below), whose sum is σ = 37435229568. Its totient is φ = 8933406552.

The previous prime is 21340916251. The next prime is 21340916281. The reversal of 21340916254 is 45261904312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340916251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17724412 + ... + 17725615.

It is an arithmetic number, because the mean of its divisors is an integer number (2339701848).

Almost surely, 2^21340916254 is an apocalyptic number.

21340916254 is a deficient number, since it is larger than the sum of its proper divisors (16094313314).

21340916254 is a wasteful number, since it uses less digits than its factorization.

21340916254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35450079.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21340916254 in words is "twenty-one billion, three hundred forty million, nine hundred sixteen thousand, two hundred fifty-four".