21051551410 has 32 divisors (see below), whose sum is σ = 39899672640. Its totient is φ = 7974925632.

The previous prime is 21051551387. The next prime is 21051551447. The reversal of 21051551410 is 1415515012.

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, 658312 + ... + 689548.

It is an arithmetic number, because the mean of its divisors is an integer number (1246864770).

Almost surely, 2^21051551410 is an apocalyptic number.

21051551410 is a deficient number, since it is larger than the sum of its proper divisors (18848121230).

21051551410 is a wasteful number, since it uses less digits than its factorization.

21051551410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34810.

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 21051551410 in words is "twenty-one billion, fifty-one million, five hundred fifty-one thousand, four hundred ten".