21257154510 has 32 divisors (see below), whose sum is σ = 51201368352. Its totient is φ = 5648108160.

The previous prime is 21257154473. The next prime is 21257154539. The reversal of 21257154510 is 1545175212.

It is a Curzon number.

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, 1270701 + ... + 1287320.

It is an arithmetic number, because the mean of its divisors is an integer number (1600042761).

Almost surely, 2^21257154510 is an apocalyptic number.

21257154510 is an abundant number, since it is smaller than the sum of its proper divisors (29944213842).

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

21257154510 is a wasteful number, since it uses less digits than its factorization.

21257154510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558308.

The product of its (nonzero) digits is 14000, while the sum is 33.

The spelling of 21257154510 in words is "twenty-one billion, two hundred fifty-seven million, one hundred fifty-four thousand, five hundred ten".