102121021010 has 16 divisors (see below), whose sum is σ = 188301200472. Its totient is φ = 39852105600.

The previous prime is 102121021003. The next prime is 102121021021. The reversal of 102121021010 is 10120121201.

It can be written as a sum of positive squares in 4 ways, for example, as 62705668921 + 39415352089 = 250411^2 + 198533^2 .

It is a super-2 number, since 2×102121021010² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102121020982 and 102121021000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124537421 + ... + 124538240.

Almost surely, 2^102121021010 is an apocalyptic number.

102121021010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102121021010 is a deficient number, since it is larger than the sum of its proper divisors (86180179462).

102121021010 is a wasteful number, since it uses less digits than its factorization.

102121021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249075709.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102121021010 its reverse (10120121201), we get a palindrome (112241142211).

The spelling of 102121021010 in words is "one hundred two billion, one hundred twenty-one million, twenty-one thousand, ten".