1400420021 has 48 divisors (see below), whose sum is σ = 1973237760. Its totient is φ = 963293760.

The previous prime is 1400420011. The next prime is 1400420041. The reversal of 1400420021 is 1200240041.

It is a de Polignac number, because none of the positive numbers 2^k-1400420021 is a prime.

It is a super-2 number, since 2×1400420021² = 3922352470435280882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1400419978 and 1400420005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400420011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296960 + ... + 301638.

It is an arithmetic number, because the mean of its divisors is an integer number (41109120).

Almost surely, 2^1400420021 is an apocalyptic number.

1400420021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1400420021 is a deficient number, since it is larger than the sum of its proper divisors (572817739).

1400420021 is a wasteful number, since it uses less digits than its factorization.

1400420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746 (or 4733 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1400420021 is about 37422.1862135285. The cubic root of 1400420021 is about 1118.8008053829.

Adding to 1400420021 its reverse (1200240041), we get a palindrome (2600660062).

The spelling of 1400420021 in words is "one billion, four hundred million, four hundred twenty thousand, twenty-one".