21007153850 has 24 divisors (see below), whose sum is σ = 39452668320. Its totient is φ = 8321278320.

The previous prime is 21007153841. The next prime is 21007153859. The reversal of 21007153850 is 5835170012.

It is an interprime number because it is at equal distance from previous prime (21007153841) and next prime (21007153859).

It is not an unprimeable number, because it can be changed into a prime (21007153859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2034380 + ... + 2044679.

It is an arithmetic number, because the mean of its divisors is an integer number (1643861180).

Almost surely, 2^21007153850 is an apocalyptic number.

21007153850 is a deficient number, since it is larger than the sum of its proper divisors (18445514470).

21007153850 is a wasteful number, since it uses less digits than its factorization.

21007153850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079174 (or 4079169 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 21007153850 in words is "twenty-one billion, seven million, one hundred fifty-three thousand, eight hundred fifty".