1251452433021 has 16 divisors (see below), whose sum is σ = 1942955800704. Its totient is φ = 701622926784.

The previous prime is 1251452432927. The next prime is 1251452433029. The reversal of 1251452433021 is 1203342541521.

It is not a de Polignac number, because 1251452433021 - 2¹¹ = 1251452430973 is a prime.

It is a super-2 number, since 2×1251452433021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251452433029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562196746 + ... + 562198971.

It is an arithmetic number, because the mean of its divisors is an integer number (121434737544).

Almost surely, 2^{1251452433021} is an apocalyptic number.

It is an amenable number.

1251452433021 is a deficient number, since it is larger than the sum of its proper divisors (691503367683).

1251452433021 is a wasteful number, since it uses less digits than its factorization.

1251452433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124395780.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 1251452433021 its reverse (1203342541521), we get a palindrome (2454794974542).

It can be divided in two parts, 12514524 and 33021, that added together give a triangular number (12547545 = T₅₀₀₉).

The spelling of 1251452433021 in words is "one trillion, two hundred fifty-one billion, four hundred fifty-two million, four hundred thirty-three thousand, twenty-one".