1200402021 has 16 divisors (see below), whose sum is σ = 1969890944. Its totient is φ = 633178944.

The previous prime is 1200402019. The next prime is 1200402031. The reversal of 1200402021 is 1202040021.

It is not a de Polignac number, because 1200402021 - 2¹ = 1200402019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200401988 and 1200402006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200402031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2198266 + ... + 2198811.

It is an arithmetic number, because the mean of its divisors is an integer number (123118184).

Almost surely, 2^1200402021 is an apocalyptic number.

It is an amenable number.

1200402021 is a deficient number, since it is larger than the sum of its proper divisors (769488923).

1200402021 is a wasteful number, since it uses less digits than its factorization.

1200402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397100.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1200402021 is about 34646.8183387739. The cubic root of 1200402021 is about 1062.7772256720. Note that the first 3 decimals are identical.

Adding to 1200402021 its reverse (1202040021), we get a palindrome (2402442042).

The spelling of 1200402021 in words is "one billion, two hundred million, four hundred two thousand, twenty-one".