21149070 has 32 divisors (see below), whose sum is σ = 51334560. Its totient is φ = 5576384.

The previous prime is 21149069. The next prime is 21149083. The reversal of 21149070 is 7094112.

It is a self number, because there is not a number n which added to its sum of digits gives 21149070.

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, 237586 + ... + 237674.

It is an arithmetic number, because the mean of its divisors is an integer number (1604205).

Almost surely, 2^21149070 is an apocalyptic number.

21149070 is an abundant number, since it is smaller than the sum of its proper divisors (30185490).

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

21149070 is an frugal number, since it uses more digits than its factorization.

21149070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21149070 is about 4598.8118030639. The cubic root of 21149070 is about 276.5436930299.

The spelling of 21149070 in words is "twenty-one million, one hundred forty-nine thousand, seventy".