201421153440 has 192 divisors, whose sum is σ = 759203020800. Its totient is φ = 49580577792.

The previous prime is 201421153399. The next prime is 201421153447. The reversal of 201421153440 is 44351124102.

201421153440 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 211 + 5 + 3 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (201421153447) 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, 1737120 + ... + 1849439.

It is an arithmetic number, because the mean of its divisors is an integer number (3954182400).

Almost surely, 2^201421153440 is an apocalyptic number.

201421153440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201421153440 is an abundant number, since it is smaller than the sum of its proper divisors (557781867360).

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

201421153440 is a wasteful number, since it uses less digits than its factorization.

201421153440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586596 (or 3586582 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 201421153440 its reverse (44351124102), we get a palindrome (245772277542).

The spelling of 201421153440 in words is "two hundred one billion, four hundred twenty-one million, one hundred fifty-three thousand, four hundred forty".