210154421 has 4 divisors (see below), whose sum is σ = 221215200. Its totient is φ = 199093644.

The previous prime is 210154409. The next prime is 210154453. The reversal of 210154421 is 124451012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210154421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210154393 and 210154402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210154481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5530361 + ... + 5530398.

It is an arithmetic number, because the mean of its divisors is an integer number (55303800).

Almost surely, 2^210154421 is an apocalyptic number.

It is an amenable number.

210154421 is a deficient number, since it is larger than the sum of its proper divisors (11060779).

210154421 is a wasteful number, since it uses less digits than its factorization.

210154421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11060778.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 210154421 is about 14496.7037977604. The cubic root of 210154421 is about 594.5378526546.

The spelling of 210154421 in words is "two hundred ten million, one hundred fifty-four thousand, four hundred twenty-one".