21106035550 has 24 divisors (see below), whose sum is σ = 39402112032. Its totient is φ = 8411256000.

The previous prime is 21106035547. The next prime is 21106035569. The reversal of 21106035550 is 5553060112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 765271 + ... + 792370.

It is an arithmetic number, because the mean of its divisors is an integer number (1641754668).

Almost surely, 2^21106035550 is an apocalyptic number.

21106035550 is a deficient number, since it is larger than the sum of its proper divisors (18296076482).

21106035550 is a wasteful number, since it uses less digits than its factorization.

21106035550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557924 (or 1557919 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 21106035550 its reverse (5553060112), we get a palindrome (26659095662).

The spelling of 21106035550 in words is "twenty-one billion, one hundred six million, thirty-five thousand, five hundred fifty".