210021201138 has 24 divisors (see below), whose sum is σ = 488620754352. Its totient is φ = 60006057384.

The previous prime is 210021201101. The next prime is 210021201139. The reversal of 210021201138 is 831102120012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (210021201139) 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, 357178620 + ... + 357179207.

It is an arithmetic number, because the mean of its divisors is an integer number (20359198098).

Almost surely, 2^210021201138 is an apocalyptic number.

210021201138 is an abundant number, since it is smaller than the sum of its proper divisors (278599553214).

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

210021201138 is a wasteful number, since it uses less digits than its factorization.

210021201138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714357846 (or 714357839 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The spelling of 210021201138 in words is "two hundred ten billion, twenty-one million, two hundred one thousand, one hundred thirty-eight".