21012011010 has 32 divisors (see below), whose sum is σ = 56032030080. Its totient is φ = 5603202864.

The previous prime is 21012010967. The next prime is 21012011051. The reversal of 21012011010 is 1011021012.

It is a happy number.

It is a super-2 number, since 2×21012011010² (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 = 21012010983 and 21012011001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38910862 + ... + 38911401.

It is an arithmetic number, because the mean of its divisors is an integer number (1751000940).

Almost surely, 2^21012011010 is an apocalyptic number.

21012011010 is an abundant number, since it is smaller than the sum of its proper divisors (35020019070).

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

21012011010 is a wasteful number, since it uses less digits than its factorization.

21012011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77822279 (or 77822273 counting only the distinct ones).

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

Adding to 21012011010 its reverse (1011021012), we get a palindrome (22023032022).

The spelling of 21012011010 in words is "twenty-one billion, twelve million, eleven thousand, ten".