21101049 has 24 divisors (see below), whose sum is σ = 32078592. Its totient is φ = 13347360.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101049 is 94010112.

It is not a de Polignac number, because 21101049 - 2⁴ = 21101033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14074 + ... + 15500.

It is an arithmetic number, because the mean of its divisors is an integer number (1336608).

Almost surely, 2^21101049 is an apocalyptic number.

It is an amenable number.

21101049 is a deficient number, since it is larger than the sum of its proper divisors (10977543).

21101049 is a wasteful number, since it uses less digits than its factorization.

21101049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 21101049 is about 4593.5878134635. The cubic root of 21101049 is about 276.3342280513.

The spelling of 21101049 in words is "twenty-one million, one hundred one thousand, forty-nine".