1021200003 has 12 divisors (see below), whose sum is σ = 1475706960. Its totient is φ = 680504496.

The previous prime is 1021199983. The next prime is 1021200017. The reversal of 1021200003 is 3000021201.

It is a happy number.

It is not a de Polignac number, because 1021200003 - 2¹⁰ = 1021198979 is a prime.

It is a super-2 number, since 2×1021200003² = 2085698892254400018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1021200203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1608 + ... + 45221.

It is an arithmetic number, because the mean of its divisors is an integer number (122975580).

Almost surely, 2^1021200003 is an apocalyptic number.

1021200003 is a deficient number, since it is larger than the sum of its proper divisors (454506957).

1021200003 is a wasteful number, since it uses less digits than its factorization.

1021200003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49258 (or 49255 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1021200003 is about 31956.2200987539. The cubic root of 1021200003 is about 1007.0173098456.

Adding to 1021200003 its reverse (3000021201), we get a palindrome (4021221204).

The spelling of 1021200003 in words is "one billion, twenty-one million, two hundred thousand, three".