21154542410 has 8 divisors (see below), whose sum is σ = 38078176356. Its totient is φ = 8461816960.

The previous prime is 21154542401. The next prime is 21154542419. The reversal of 21154542410 is 1424545112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21154542401) and next prime (21154542419).

It can be written as a sum of positive squares in 2 ways, for example, as 20194967881 + 959574529 = 142109^2 + 30977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21154542419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057727111 + ... + 1057727130.

Almost surely, 2^21154542410 is an apocalyptic number.

21154542410 is a deficient number, since it is larger than the sum of its proper divisors (16923633946).

21154542410 is a wasteful number, since it uses less digits than its factorization.

21154542410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115454248.

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 21154542410 in words is "twenty-one billion, one hundred fifty-four million, five hundred forty-two thousand, four hundred ten".