421958901 has 32 divisors (see below), whose sum is σ = 693968128. Its totient is φ = 222082560.

The previous prime is 421958869. The next prime is 421958909. The reversal of 421958901 is 109859124.

It is not a de Polignac number, because 421958901 - 2⁵ = 421958869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 421958901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421958909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146265 + ... + 149121.

It is an arithmetic number, because the mean of its divisors is an integer number (21686504).

Almost surely, 2^421958901 is an apocalyptic number.

It is an amenable number.

421958901 is a deficient number, since it is larger than the sum of its proper divisors (272009227).

421958901 is a wasteful number, since it uses less digits than its factorization.

421958901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 421958901 is about 20541.6382258086. The cubic root of 421958901 is about 750.0497158155.

It can be divided in two parts, 42195890 and 1, that added together give a triangular number (42195891 = T₉₁₈₆).

The spelling of 421958901 in words is "four hundred twenty-one million, nine hundred fifty-eight thousand, nine hundred one".