1001402021 has 4 divisors (see below), whose sum is σ = 1033705344. Its totient is φ = 969098700.

The previous prime is 1001401997. The next prime is 1001402053. The reversal of 1001402021 is 1202041001.

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 not a de Polignac number, because 1001402021 - 2⁶ = 1001401957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001401993 and 1001402011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001402071) 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, 16151615 + ... + 16151676.

It is an arithmetic number, because the mean of its divisors is an integer number (258426336).

Almost surely, 2^1001402021 is an apocalyptic number.

It is an amenable number.

1001402021 is a deficient number, since it is larger than the sum of its proper divisors (32303323).

1001402021 is an equidigital number, since it uses as much as digits as its factorization.

1001402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32303322.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1001402021 is about 31644.9367355980. The cubic root of 1001402021 is about 1000.4671220963.

Adding to 1001402021 its reverse (1202041001), we get a palindrome (2203443022).

The spelling of 1001402021 in words is "one billion, one million, four hundred two thousand, twenty-one".