1000021311 has 24 divisors (see below), whose sum is σ = 1570789584. Its totient is φ = 610502400.

The previous prime is 1000021291. The next prime is 1000021333. The reversal of 1000021311 is 1131200001.

It is not a de Polignac number, because 1000021311 - 2⁶ = 1000021247 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1000021293 and 1000021302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82665 + ... + 93986.

It is an arithmetic number, because the mean of its divisors is an integer number (65449566).

Almost surely, 2^1000021311 is an apocalyptic number.

1000021311 is a deficient number, since it is larger than the sum of its proper divisors (570768273).

1000021311 is a wasteful number, since it uses less digits than its factorization.

1000021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176711 (or 176708 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1000021311 is about 31623.1135563847. The cubic root of 1000021311 is about 1000.0071036162.

Adding to 1000021311 its reverse (1131200001), we get a palindrome (2131221312).

The spelling of 1000021311 in words is "one billion, twenty-one thousand, three hundred eleven".