210121442 has 8 divisors (see below), whose sum is σ = 318242496. Its totient is φ = 104040612.

The previous prime is 210121423. The next prime is 210121451. The reversal of 210121442 is 244121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 210121442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509798 + ... + 510209.

It is an arithmetic number, because the mean of its divisors is an integer number (39780312).

Almost surely, 2^210121442 is an apocalyptic number.

210121442 is a deficient number, since it is larger than the sum of its proper divisors (108121054).

210121442 is a wasteful number, since it uses less digits than its factorization.

210121442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020112.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 210121442 is about 14495.5662876619. The cubic root of 210121442 is about 594.5067512555.

Adding to 210121442 its reverse (244121012), we get a palindrome (454242454).

The spelling of 210121442 in words is "two hundred ten million, one hundred twenty-one thousand, four hundred forty-two".