1400402021 has 4 divisors (see below), whose sum is σ = 1402429344. Its totient is φ = 1398374700.

The previous prime is 1400401999. The next prime is 1400402023. The reversal of 1400402021 is 1202040041.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1202040041 = 17021 ⋅70621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1400402021 is a prime.

It is a super-2 number, since 2×1400402021² = 3922251640841768882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1400401987 and 1400402005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400402023) 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, 1012625 + ... + 1014006.

It is an arithmetic number, because the mean of its divisors is an integer number (350607336).

Almost surely, 2^1400402021 is an apocalyptic number.

It is an amenable number.

1400402021 is a deficient number, since it is larger than the sum of its proper divisors (2027323).

1400402021 is an equidigital number, since it uses as much as digits as its factorization.

1400402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027322.

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

The square root of 1400402021 is about 37421.9457137119. The cubic root of 1400402021 is about 1118.7960119399.

Adding to 1400402021 its reverse (1202040041), we get a palindrome (2602442062).

The spelling of 1400402021 in words is "one billion, four hundred million, four hundred two thousand, twenty-one".