201211902 has 24 divisors (see below), whose sum is σ = 436497984. Its totient is φ = 66987744.

The previous prime is 201211877. The next prime is 201211909. The reversal of 201211902 is 209112102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9058 + ... + 22010.

It is an arithmetic number, because the mean of its divisors is an integer number (18187416).

Almost surely, 2^201211902 is an apocalyptic number.

201211902 is an abundant number, since it is smaller than the sum of its proper divisors (235286082).

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

201211902 is a wasteful number, since it uses less digits than its factorization.

201211902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13824 (or 13821 counting only the distinct ones).

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

The square root of 201211902 is about 14184.9181174937. The cubic root of 201211902 is about 585.9823774438.

Subtracting from 201211902 its product of nonzero digits (72), we obtain a triangular number (201211830 = T₂₀₀₆₀).

The spelling of 201211902 in words is "two hundred one million, two hundred eleven thousand, nine hundred two".