20111021010 has 80 divisors (see below), whose sum is σ = 56922465600. Its totient is φ = 5080675104.

The previous prime is 20111020957. The next prime is 20111021023. The reversal of 20111021010 is 1012011102.

It is a happy number.

It is a super-2 number, since 2×20111021010² (a number of 21 digits) contains 22 as substring.

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 = 20111020983 and 20111021001.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 637990 + ... + 668769.

It is an arithmetic number, because the mean of its divisors is an integer number (711530820).

Almost surely, 2^20111021010 is an apocalyptic number.

20111021010 is an abundant number, since it is smaller than the sum of its proper divisors (36811444590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111021010 is a wasteful number, since it uses less digits than its factorization.

20111021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306797 (or 1306788 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111021010 its reverse (1012011102), we get a palindrome (21123032112).

The spelling of 20111021010 in words is "twenty billion, one hundred eleven million, twenty-one thousand, ten".